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1999 BMW Z3 Spark Plug 6 Cyl 2.5L Bosch

4 on 84 ratings
  • Features:
    • Revolutionary surface air gap firing technology featuring multiple spark paths that delivers the longest, most powerful spark for ultimate engine performance
    • More platinum vs. Bosch Platinum Plus for smoother acceleration, top fuel economy and maximum engine power
    • Four yttrium enhanced ground electrodes provides optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life
    • Electrode gap is factory set which never requires adjustment and ensures ease of installation
  • The best of the Bosch Platinum Series, with the most platinum, delivers maximum engine power for a longer performance life.
  • Suggested Purchase Quantity: 12
    • Most jobs typically require 12 of this item.

Additional Fitment Information:
Vehicle Block CC Engine CID
1999 BMW Z3 L 2494 6 Cyl 2.5L 152
18 In Stock
Best Price:

Holiday Special

$18.46 USD
$22.15 USD
Brand Bosch
Part # B416743
Condition New
Warehouse B
Bosch

Z3 Bosch Spark Plug 6743 1999 BMW
  • Bosch Platinum+4 Spark Plug
  • Do Not Gap, Gap is Preset Original Center Electrode Material is Platinum
  • OE Fine Wire Platinum
    • As one of the largest North American automotive suppliers, Bosch develops, manufactures and supplies precision components and systems - including body electronics, chassis and powertrain products - for vehicle manufacturers worldwide. Since its foundation 1886, the company accelerates the progress of Automotive Technology with continued innovations.

    Bosch is a globally recognized company that manufacture's tools, parts, and equipment in a wide variety of industries and is respected for their quality and innovation many times over, especially in the automotive industry, both as an Original Equipment Manufacturer and aftermarket manufacture. Bosch produces some of the best auto parts in the following categories; gasoline fuel pump and delivery systems, diesel fuel pump and ignition, chassis system controls, electric motors, starters and alternators, all sorts of automotive electronics and sensors, steering systems, and more!

    General

    Prop 65 Warning Label Required?
    No
    Ground Electrode Tip Material
    Nickel-yttrium
    Center Electrode Core Material
    Nickel-cobalt
    Cases Per Pallet (ORLY)
    60
    Ground Electrode Tip Design
    Multiple
    Outdoor Power Equipment Application
    No
    Pre-Gap Size
    1.6
    Insulator Type
    Non-projected
    Ground Electrode Core Material
    N/a
    Short Style
    No
    Seat Type
    Flat
    Ground Electrode Quantity
    4
    Package Contents
    Spark Plug
    Spark Plug Type
    4-cycle
    Insulator Material
    Ceramic
    Reach
    19
    Center Electrode Tip Material
    Platinum
    Resistor
    Yes
    Manufacturer Heat Range
    7
    Ground Configuration
    Multiple
    Product Length
    2.911417 In
    Resistance
    3000
    Product Width
    0.748031 In
    Previously cataloged as #
    4417

    Packaging

    bar code
    4047024115552
    package quantity
    1
    length
    0.94 in
    width
    1.06 in
    height
    3.50 in
    weight
    0.10 lb
    Information on technical characteristics, the delivery set, the country of manufacture and the appearance of the goods is for reference only and is based on the latest information available at the time of publication.
    1. Rick
      09 Apr, 2015
      I've been using these plugs for most of the time I've had my Toyota and they are replacing the original NGK plugs. The Bosch seem to start the car easier, run smoother and give better gas mileage, and though ,mechanics recommend the original kind, I won't use any other than these.
    2. Josh
      04 Apr, 2015
      I put these +4's in everything I drive. Typically, they will increase mileage by 10%. The only thing better was when they made ring-fire plugs which no-one makes anymore. Hard to beat the price of them here on AutoPartsWAY.
    3. David A. Koscinch
      25 Mar, 2015
      The best of Russian craftsmanship for my '72 VW Beetle.
    4. AutoPartsWAY Customer
      20 Mar, 2015
      Not NGK but close enough. Works well in my wifes 07 Odyssey.
    5. carolyn Sasser
      17 Jan, 2015
      These spark plugs are working just fine. Thank you AutoPartsWAY.
    6. Charles Kincade
      04 Jan, 2015
      Big improvement in power and gas milage
    7. J. Baker
      02 Jan, 2015
      I put these in my 2007 toyota fj cruiser... immediately notice the truck runs a lot more smoother and over the weeks also noticed a small improvement in gas milage .. Overall the truck runs better than before (this was compared to toyota dealership regular spark plugs)Not related but noteworthy.... (i do not run my tank to empty not a good idea living in the country) so all milage is to a 1/8 of a tank of gas.... My FJ is a premium fuel vehicle meaning it needs to run 91+ octane or higher. since the mandatory ethanol law all the gas stations in my area have changed to 87 octane. when I was running 91+ octane i was barely getting 250 miles to a tank of gas after the mandatory ethanol law I was forced to run 87 octane with 10% ethanol which I would only get 175 miles to a tank of gas... (huge drop was not happy about that) I put in the Bosch Iridium Fine Wire Spark Plug it boosted the gas milage to around 200 miles to a tank of gas.. then changed the oil from toyota's...
    8. James Holt
      01 Jan, 2015
      As always, I was quite pleased with the Bosch Platinum plug.
    9. Julius F.
      05 Dec, 2014
      great would buy them again
    10. Michael M. "MIke M."
      26 Nov, 2014
      Good
    11. Larry C
      13 Nov, 2014
      How does one write an informed review of something like a spark plug unless one has some kind of exotic test gear?The gap setting on these for my car is 42 to 46; the gap of the old ones I pulled was > 70 and they were still firing, I hope these will do as well.Any how, I installed them and my car is running fine so time will tell.
    12. James J "James Jamias"
      03 Oct, 2014
      Great spark conductor. Works really well like heavy duty copper. Copper is the best conductor of electricity, and this item resembles the reliability of good contact and transfer of electrons for a great spark and no misfires. After replacing four plugs. I have notice less engine loss of power and regained better MPGs in the long commutes after four weeks.
    13. Richard
      18 Sep, 2014
      Prefer if it came with pre-applied anti-seize lubricant.
    14. livebike
      07 Sep, 2014
      These were in my used Ford 1996 Tbird 4.6L That engine is a pain in the butt with it's deep plug wells harboringall forms of debris just waiting to fall into the combustion chambers upon plug removal. Carefully blow that crapout with a plastic tube first and use a socket which holds the plug for removal and replacement. These plugsare good but Ford engineering has complicated my life. I bought (4) of these to address a misfire trouble codewhich was simply due to conductive crud in the plug well (coolant can cause this also)
    15. Conrad
      26 Aug, 2014
      Spark plugs are often debated among enthusiasts. Bosch is always a solid bet and the only thing my BMW's won't complain about. Your best bet, because of wear pattern in the block, is to use the plug your car came with from the factory. If your car came with Bosch replace with Bosch and it will all work out.
    16. D.C.
      21 Aug, 2014
      Excellent quality as expected of Bosch. It says gap is set from factory, but I checked and 3 out of 5 needed slight adjustment.
    17. C Henkel
      21 Aug, 2014
      just what I needed at a good price. Installed fine and vehicle runs great now.
    18. R. Slegel "Majick1"
      14 Aug, 2014
      I have been using Bosch +4s in all my vehicles simply because I never have to replace them again, which is especially important with the modern transverse V-6 engines rear plugs being so inaccessible.The design of the plug puts the spark across the face, directly into the fuel mixture so in performance applications one does not have to ever index plugs again. With 4 electrodes there is always one ready to fire no matter how “worn” or “fouled” the others become.Your engine cannot help but perform more efficiently until the day you sell it.The biggest problem I have found with these plugs is a lot of garages take them out and replace them with their own crap claiming your car was running bad because of “junk” plugs. I took a car in for AC work and they pulled that on me, but I finally forced them to buy me a new set and install them as my “old” ones were thrown out. Amazing what a letter to the local paper will...
    19. Kruse
      04 Aug, 2014
      I changed these on our Volvo XC70 and I would have to say I see a better idle. Driving seems just the same but idle is smoother and quieter. All the dealers say to go with nothing but Volvo plugs but these were a 10th of the price after the rebate. Could be a combination of having a contact-less throttle position sensor and Bosch coil packs, from what I've also heard from others with the same equipment. I will get these again next time I need them. Bosch has been good with everything I have tried so far.
    20. Jason Bucy
      27 Jul, 2014
      Thank you. Item is as described and arrived in a very timely matter.
    21. John W.
      26 Jul, 2014
      I bought 4 of these and installed them myself on my wife's 2008 Kia Optima. The ones I replaced were OEM and had been in there for 90,000 miles. They were visibly worn out. The car had been rough idling, and it turned out this was the reason. After replacement, the rough idling stopped.Changing the spark plugs is an easy thing to do with the right tools (a spark plug socket and wrench extender). This was my first time doing it, and it was relatively easy. There are plenty of video guides on youtube on how to do this. I'm confident these iridium spark plugs will last me another 100k miles. If not, I'll be sure to update my review.The fact that the gap is preset on these is also very convenient. If you don't know anything about setting gaps on spark plugs, you never need to with these :)
    22. Jim
      11 Jul, 2014
      Easy installation. Engine runs fine.So far I am seeing a 1-2 MPG increase in mileage.
    23. Andrew Smith
      11 Jul, 2014
      Works
    24. Rebel"K" "Karl"
      24 May, 2014
      Bosh has been in business for a long time and their products exude excellence and attention to detail. The Platinum plus spark plug is one of the best buys for the money, and you should notice a improvement in performance and fuel economy. Not all spark plugs are the same, and this is one of the best. I have worked as a professional mechanic and on cars for 60 years, so I have a little knowledge of what works and what does not.
    25. Bryon
      13 May, 2014
      Exact fit and made my beetle motor run a lot better. I was very satisfied with the spark plugs. I received them in a timely manner as well.
    26. ray
      06 May, 2014
      I've been working on my car little by little. Although it still has issues here and there, I certainly feel a strong response from the throttle. Regardless of cost, I will continue to use these plugs in my 20 year old vehicle.
    27. Melissa M.
      24 Apr, 2014
      Fit my 2005 Tacoma perfectly, easy to install, and the right price. Glad I got them here instead of through my local Auto parts store.
    28. J R
      06 Apr, 2014
      These plugs work well and are much less expensive than the OEM Volvo plugs. They last about 10-15K miles before needing to be sharpened up and regapped. These are a good alternative to the OEM plugs.
    29. Celeste and Gampy
      26 Mar, 2014
      These seem to be great plugs.I am changing them outjust because it seems 60K is enough. All I have laying around are some ND 3168 platinums so I will install those. NOTE that the design of these plugs is such that you could never tell if they are "worn out" in the traditional sense. The center electrode is but a tiny wire set in porcelain and the twin side electrodes are non-adjustable and do not seem to erode at all. I will carry these well used Bosch plugs as back-up when I travel in Baja and would have no qualms about placing them back in the engine if needed.Two thumbs up from me!
    30. Frisbee
      08 Feb, 2014
    31. I call it like it is
      14 Jan, 2014
      Bought a used 1988 Bronco that idled very rough hot and cold. Replaced the belt and plugs and wires. Huge difference in power output and response. No gap issues with these plugs and the cost via AutoPartsWAY combined with no-cost shipping (Prime) was well worth it.
    32. kristian Hoffland
      20 Dec, 2013
      Wish I had paid more attention when I had these installed for my old old ones in my older 1990 audi, but I forgot to really pay attention and now who knows how well they really work. well, they haven't failed yet and I'm sure I am getting way better spark than a ordinary single pronged plug.
    33. William C.
      15 Dec, 2013
      Worked great in my 1991 Ford Explorer, I change plugs every 2 years prior to smog test and always pass ...plus the car runs better I believe. I have always been pleased with Bosch plugs ... these were made in Russia.
    34. Walnut Creek Kid
      30 Nov, 2013
      Iridium is the way to go - read the many reviews on the spark voltage and lifespan of these puppies. As for the name brand it has hard to tell which one is best. Watch for rebates. NGK seems to offer different grades of Iridium plugs
    35. Carl M. Schmidli
      21 Nov, 2013
      High performing plug. Much too early to properly evaluate this plug. Need more time to evaluate . Some earlier platinum plugs tended to fail under higher heat conditions.
    36. zulma garcia
      05 Oct, 2013
      this purchase really filled my expectations, and much more, excellent buy, good price, excellent quality, no problems in the delivery. I recommend it was just what I needed
    37. codawson "Carlos Chaos"
      18 Sep, 2013
      My poor ol' Jeep really loves these plugs... I'm getting better performance and gas mileage - I couldn't be happier.
    38. Fred
      17 Sep, 2013
      I tried all the automotive stores in my area for this plug - no joy. I know I could count on AutoPartsWAY to come through! With these plugs I can get a nice clean burn in the cylinder. I liked them so much I bought three more pairs. They arrived in perfect shape!
    39. Menno Aartsen "MEA"
      14 Sep, 2013
      Dayco 5060875 Serpentine Belt
    40. John Russo
      13 Sep, 2013
      I received good service with my last set with approximately 90, 000 miles on them on my '91 Toyota Land Cruiser with the 3FE motor. I probably won't go as far this time around as a new set makes the Land Cruiser operate smoother. Bosch makes a good product.
    41. Brian Miller
      06 Sep, 2013
      Great spark plugs for the money. You only replace these every few years anyway. Good idea for improved gas mileage and performance.
    42. AutoPartsWAY Customer CRC "(gadget guy)"
      04 Jul, 2013
      These plugs work great in my '94 Trooper V6. Replaced plugs & wires to fix a misfire and low power problem. These helped but did not fix the problem -- replaced the 3 coils also, now the truck runs fantastic again just like new.
    43. Vinnie T
      30 Jun, 2013
      Bosch finally came into the 21st century by adding Iridium plugs to their lineup. This is a great plug in that it combines iridium in the center electrode with platinum on the ground electrode which should make this plug last for up to 100K miles. Some plugs do not give you the platinum on the ground tip which then wears at a faster rate than the center electrode. Nice $2 rebate on top of that.
    44. Matthew Dyer
      02 Jun, 2013
      The garage wanted $160 to replace the spark plugs. If you are capable of making a bowl of cereal, you are capable of doing this job yourself. On a 2000 Honda Accord four cylinder the plugs are right on top of the block and are nicely sealed off by the spark plug boot. Pop off the boot and unscrew the plug. I used anti-seize compound on the threads of these new Bosch plugs, even though I'd read elsewhere that the threads won't corrode. Tighten with a torque wrench to 13 foot pounds, put a dollop of dielectric grease in the boot, and you're done. These plugs are sold as pre-gapped and I checked every one and they were perfect right out of the box. Really, if you can make a bowl of cereal you can do this job yourself. Great plugs at a good price. Bosch makes quality stuff.
    45. Larry H
      14 May, 2013
      These plugs are great! I picked up almost one mile to the gallon right away and expect more. The fine wire scared me at first, but they are very well made and designed for hard and long use.I would recommend them to anyone over the stock plugs for longevity and performance
    46. Capeman
      06 May, 2013
      This is a super price for these plugs. These are for my 1978 Super beetle project that I have been working on for over a year now. I have found the most obscurer items right here on AutoPartsWAY for this car and of course ordering them for much less than the local auto parts.
    47. Pine1000
      16 Mar, 2013
      I'm just replacing the Bosch Platinum FR8LPX that I put into my Jeep Grand Cherokee at 40,000 miles. The Jeep now has over 160,000 miles. So, I feel like I got my money's worth.I'm glad I didn't use the champion plugs that was recommended by the dealer parts counter.
    48. Webb Seller
      12 Mar, 2013
      Time will tell if they are as good as the Volvo plugs that I took out (100,000 miles old).Use anti-seize on the threads or they get pretty hard to take out after 100K miles.
    49. EZ Bobby
      23 Jan, 2013
      Make sure to check you spark plug gaps as these weren't set for my 1982 Mercedes Benz. But are working great and fair price.
    50. Jcdew67
      22 Jan, 2013
      I have these plugs is a 1992 Pontiac Firebird(3.1L v-6),1996 Monte Carlo(3.1L v-6),1972 Chevy Pick-up(350 v-8),2003 Chevy Impala(3.4L v-6) and have no problem.The 1972 PU +4's are 14 years old,90k miles and still look and work like new.(useing a GM HEI Ignition)I get 34 miles per gallon on the Highway with the Monte Carlo(was 29 from the factory with stock plugs)I can't tell you how these plugs work in other makes and models but I can tell you for what I listed I have never found a plug to match the dependability of these plugs.
    51. Misterart
      17 Jan, 2013
      Best price I could find, even better with the offered mail-in rebate; only problem I had was this plug was 1/4" longer than what I currently had, and I returned them fearing they could damage a piston?? Yes, they were pre-gapped and yes, platinum +4 but a lot longer than OEM and I did NOT want to take a chance on engine damage; could have been confused with the Ford "Lightning" engine maybe??I searched everywhere, to include Bosch itself, and could not find an answer to my concern and again, had to return them??
    52. Yaser
      08 Jan, 2013
      its run the engine very smooth with decrease fuel consumption and increase the engine performance it is fantastic product i love it
    53. Javier
      06 Jan, 2013
      I had to change the spark plugs every 5,000 miles. Are carried over 30,000 installed and are still operating as recently instaldas!I recommend this product for your car
    54. Enjoying Life
      28 Dec, 2012
      Yes, vroom, put these in my 2000 explorer with 160,000 miles on her and she is purring and still has lots of power...
    55. AutoPartsWAY Customer
      15 Dec, 2012
      Looks more like an aircraft spark plug - with the center electrode and 4 arms coming in towards the center. I got these for my old VW Golf... sure makes it idle more constantly when cold. I used the rebate - which really make these a great deal. Have not got the cash yet... but they said 6-8 weeks. Fingers crossed!!
    56. Jesus M. Roman
      07 Dec, 2012
      These are original not knock offs priced lower than anywhere in stores they work great hard time finding these anywhere else
    57. JVCamp
      28 Oct, 2012
      Listen I love NGK plugs but Bosch at this price !?nothing bad about these plugs for this price...if price and quality mean alot to you go for it.
    58. Warriordude15
      17 Oct, 2012
      I ordered these plugs to help a firend do a tune-up. He commutes quite a bit to work and says they are fine. Couldnt find iridium plugs for cheaper!!
    59. David R. Baker
      22 Sep, 2012
      These spark plugs work much better than I expected when I installed them in my car. I had not installed new plugs for several years and I immediately noticed a significant improvement in the performance of the engine. It also seems to run much quieter and I am experiencing much better fuel economy. The car did not even run this well when it was brand new.I could have bought a much less expensive spark plug but this is a situation where you buy the best and you will never be disappointed. These were a great value when I bought them on AutoPartsWAY.
    60. J. Cosmos "jmc"
      21 Sep, 2012
      I purchased these as an upgrade for my Expedition's tune up. They are great, high quality plugs that improved start-up, power, and gas mileage. The price was less than 1/2 of any prices I could find in the auto parts stores. The plugs are build solid and there's no concern that these will separate into two pieces like the old plugs did.
    61. Yoshmann
      06 Aug, 2012
      I run these plugs in my MkII 8v Jetta. I've tried Platinums, and cannot justify the extra cost. The Bentley manual calls for this plug and they run great - and are a heck of a lot cheaper!
    62. anil
      05 Aug, 2012
      since using these plugs , I observed an increase performance on highway also smoother idle and great gas mileage. After switching from NGK V power , I'm definitely sticking to bosh as they have proven themselves.
    63. Tom Poto
      28 Jul, 2012
      I was having a problem with rough idle, so I decided to give the car a tune up. I ordered these plugs for the rating and price. Plugs delivered fast and showed up as described. Very good quality. You cannot go wrong with Platinum. The car is running smooth and these definitely helped with gas mileage.
    64. Adam Bryant
      10 Jul, 2012
      I installed these plugs on a 2011 ford focus. No plug is going to turn your car into a supercharged prius, but the difference was definitely noticeable. My car was a 2011, so everything already worked up to factory specs, but i still noticed faster starts, better acceleration, and lower rpms at cruising speeds. I also average about 2-3 mpg improvement. For how inexpensive these are, you can't go wrong. The gaps are factory preset, so i would recommend going to the bosch website to determine the exact number for your vehicle with their parts finder. Mine was 9657, yours may be different.
    65. Ryan
      03 Jul, 2012
      excellent product! It is exactly what it was describe in the ads. It fits my corolla 2008. My mechanic did not need to adjust the gap. It is already pre-gapped!
    66. Todd
      17 Jun, 2012
      I bought these plugs for my 2003 v10 Ford Excursion. After 75k miles, I needed plugs and after reading several reviews did not want "fancy" plugs with a higher spark etc. With these essentially being OEM, they were perfect. Truck idles smooth and drives great. Would buy these plugs without hesitation.
    67. lindomastro
      29 May, 2012
      Un sistema di vendita eccellente dove si trovano tutti gli articoli ed a prezzi competitivi le candelle acquistate sono davvero ottime
    68. mjo "Sometimes limits are like fear.... Only ...
      02 May, 2012
      I have to use twenty words. Hmmm. Great! Love them. I get 2 more miles per gallon in my truck, just installed a set in my Dad's Buick Park Avenue so we will see how they work for him.We took the car for a ride and it did run quieter with better response. So far as I am concerned, the best plug out there right now. Great product!
    69. J. Cleveland
      25 Apr, 2012
      I was torn whether to get an OEM plug or try these Bosch. I am very happy I upgraded and went this direction. I could actually feel the difference (probably Psychological) and my milage increased. Highly recommended
    70. N. Marks
      15 Apr, 2012
      Bought 4 of these to replace an aging set of 4 in my '97 Audi A4. Replacement was done by a mechanic which and took no time at all. Bosch continues to make quality products as usual !
    71. John Shorts
      07 Apr, 2012
      Installed these in my 2002 Ford 3.8L V6 with 102,000 miles on it and it now idles so smooth that it's like the day I drove it off the dealers lot 10+ years ago. Gas mileage and power improved also. BUY THESE! You will not regret it. 2 dollar rebate per plug, so they cost just over $4 each.Update 5/25/12: Just got my $12.00 check from the Bosch Light 'Em Up! Rebate offer. Yeah!
    72. R_USA
      13 Mar, 2012
      Will I have to say one thing that my order game a lot faster than what they said. Which was great and I could put them in my truck. The Bosch 9604 spark plug were esay to in stall and will see how good they do in the next week or so. They sound like a good plug and they come pre sit so you don't have to sit them. If they do what they say they do, it should be a good plug.
    73. J. Shiba
      05 Feb, 2012
      Replaced the old style plugs in my Chevy P30 based motor home with these. Runs smooth as new and I like the fact that there is no gapping required on these plugs. Worry free installation.
    74. ghstrider2011
      04 Dec, 2011
      Put these in my 98 K3500 4WD and so far so good. I will update this reivew after some time has passed. These are not gapped per the factory spec, I checked but you are not supposed to change them, I did not and the truck is runnig great.
    75. JS13
      21 Sep, 2011
      I recently installed these plugs on a 2 valve 5.4 Ford Expedition that has 185k+ miles. These plugs replaced a set of inconsistent and problematic Champion truck plugs that I installed 8k miles ago. Upon inspection of the new Bosch plugs the quality seems to be fantastic. After installation these plugs made the engine smoother from idle to redline and erased the spark knock that was present with the Champion plugs. They installed without a problem and when I cranked the engine I could barely tell it was running from inside the cab! Power is definitely increased over the old plugs and the difference is certainly noticeable. Also, through 1000 miles of driving with these plugs, my hand calculated fuel mileage has risen almost 2mpg along my normal commute. This was my first set of Bosch plugs but will certainly not be my last. I'm getting ready to order a set for the wife's car. I highly recommend these plugs!
    76. DISenchanted
      14 Jul, 2011
      For years I had problems with my truck (2.8 liter V-6, 5 speed, with throttle body fuel injection)in regards to pinging when going uphill.I did everything my mechanically inclined co-workers/friends and/or automotive newsgroups recommended:-gas filter-air filter-tried gas from every different gas station in town-tried octane increase additives-tuneup-new plugs-new plug wires-new electronic module inside distributor-new distributor cap and rotor- bought an OBD-I tester and daily monitored settings and readings, over a month period.Everything except replace the several hundred dollar ECM electronic control module.About 2005/2006, I discovered the Bosch +2 plugs.I bought a set of 6 and installed them.Immediately my "pinging under load" issue decreased by at least 75% or more.July 2011 - these newer Bosch +4 Iridium plugs were on gold box sale for...
    77. Mistermac "Wayne Mac"
      01 May, 2011
      I bought 4 Bosch Platinum +2 Spark Plugs for my 02 Altima SL to replace the NGK I put in them last year. I notice a little extra power and immediate increase in MPG I was getting on 19 to 20 MPG and now I'm getting 23 to 24.7 around town!! I would get the 4 prong next time, I want to see if I can get a greater increase in power. So far not a bad choice.
    78. Michael D. Miller
      23 Apr, 2011
      One of the best if not the best Plug I ever installed. And I've been doing my own car maintenance for over 40 years. From when I first backed the car out of the garage I noticed a much improved throttle response. Now after nearly 1000 miles and checking mpg I can state that I have at least a 10% gain in gas mileage, thus after 3 tank fills I've paid for the plugs. Note, that I had 90,000 miles on the original 100,000-mile factory plugs, and they looked worn when I removed them. Now I know one does get appreciable gain in horsepower from plugs alone, but when your replacing old ones you will definitely get that WOW feeling when you mash that throttle down.
    79. Gordon R. Woollings
      30 Jan, 2011
      I purchased 8 of these babys. AutoPartsWAYs shipping was exellent as usual. I had them installed in my 1995 Ford Mustang GT which I purchased about 2 months ago. They are an exellent replacement plug and I love that they never need to be gapped!! I get better performance with these plugs than from the stock plugs they replaced. I have them in all my vehicles and when the time comes to replace them, i'll get more from AutoPartsWAY!!
    80. Michael C. Dye
      12 Nov, 2010
      Bosch platinum plugs (reg, +2, +4) have worked very well for me in newer cars, not so well in those older than about 1999. They like higher voltage ignition systems. They can misfire with lower voltage. Sometimes larger plug wires fix it, it depends on the overall design of the ignition system.Despite the hype on the web and anecdotal stories, virtually all spark plug manufacturers recommend against using anti-seize compound when installing plugs. They nickle-plate the threads to protect against seizing. The anti-seize compounds, even copper based, tend to increase the resistance to ground, and to upset the torque required to seat the plugs. The silver based compound will seriously increase resistance causing misfires and serious overheating of the plugs, and I have experienced the plug ceramic tips breaking off and falling into the cylinder. It sounds like a bad valve lifter and can damage the cylinder or valves. Copper based compound is less resistance, but still often...
    81. RMR57 "Richard"
      08 Jul, 2010
      3 1/2 year update.Still purring like a kitten. Took them out to look at them a few months back and they looked clean with almost no wear after 30k miles. I expect to easily get a few more years out of them at the rate they are going...which is good since I am a tightwad.ORIGINAL POST:The old plugs were shot...they were the originals and had about 70k on them. The truck had started to stumble and hesitate so I decided to put in new plugs and found the cheapest platinums on here. Read a bunch of stuff on the net and had to laugh at all the chauvinism about certain brands. Some people love Bosch, some people say that Bosch is the worst and some people even say that their vehicle doesn't "like" the plugs, whatever that means. Well these plugs totally smoothed out the engine and are working fine after about 6 months. Guess my Chevy "likes" Bosch. Something tells me that it would like any brand. I just put a little anti-seize on the threads and a...
    82. R. Neil Ferguson "Watches"
      05 Apr, 2010
      I have long been a Bosch sparkplug fan, going back to my first Porsche (1968) followed not long after by my first BMW Bavaria (1972). I have tried other plugs, most notably NGK (my Lotus, Ferrari and my vintage Brabham Formula 2 race car). Long before that, I was a Champion addict (my two Alfa Romeos, a Triumph Spitfire, and several domestics). I can't say that NGK or Champion makes a bad plug. The NGKs were especially well suited to the Lotus' race engine and ditto for the Brabham. But then no one but Bosch had a platinum plug at back then, and I could not seem to find a good heat range (read: cold enough) match up between the Bosch platinums and the Lotus or Brabham race engines like I could with the NGK.Fast forward to the 21st century. Bosch now seems to have the right plug for almost every application. Platinums are now improved with the addition of irridium for higher heat tolerance. And then there are the plugs with multiple electrodes. At first, I thought this...
    83. Axol
      17 Dec, 2009
      Plug is cheap and works great on my 95 M3. According to the notes, this is an OE plug. I was considering the Platinum 4's but figured it wasn't worth the higher price. This is probably the best bang for the buck plug you can buy.
    84. Jake, from State Farm
      24 Apr, 2009
      Initial review was from 2009 -- This is an UPDATE -- as of 9/24/14 --The Bosch #4041 performed very well, giving great performance and fuel mileage, as well as low emissions readings at the testing station. All was right in the world, or so I thought, until an ignition mis-fire threw a monkey-wrench into a recent vacation trip. OBDII code scanner showed a #7 cylinder mis-fire, which turned out to be a really nasty-looking spark plug -- and a few others looking almost as bad. I was expecting nearly 100,000 miles from these plugs -- but only realized 40,000 miles before plug failure. Having had excellent results from Bosch plugs in the past, I was hugely disappointed in the short life of these plugs. Yes, these plugs FIT INTO the 4.6 litre FOMOCO engine -- but they are NOT the FORD-recommended "Double Platinum" type!! The low price of the 4041 plugs seemed too good to be true -- and it turned out that way !! Stuck in a small town (pop. 407), the...

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