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#31
10-19-2009, 11:28 PM
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__________________
Profeshenal spellar 
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#32
10-20-2009, 12:04 AM
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Call NGK directly and see if someone can explain the differences. Even if they last 100k, I'd rather only spend $40 instead of $200 if no one can explain any discernible difference besides a part # variation. If NGK can give you concrete evidence otherwise, I'd be buying from Amazon or whoever has the best price all day long. Of course Amazon isn't going to list some 16 digit blah blah blah number BMW uses. Last time I did spark plugs on my 740iL, I ordered them from Auto Parts at AutohausAZ - OEM Auto Parts - Discount Replacement Parts, Resources and Car Care Tips and they've worked perfectly fine.
After watching an episode of 'How It's Made', I'd NEVER pay $20 for a spark plug. I've higher powered, turbo charged cars that demand more from their plugs than the M62 and I've never paid that much, ever. At some point you have to draw the line at manufacturer propaganda and just plain common sense. My 7 came w/ completely different OEM tires that what I'm using now. Just because it came OEM, that doesn't mean its the best of the best. I really don't see this as any different.
__________________
 650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's 135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
Last edited by m5james; 10-20-2009 at 12:15 AM.
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#33
10-20-2009, 12:24 AM
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I view plugs and rubber differently, but that is also just me. We will sit here and post numerous threads about which oil and filters to use, what air filters, what brand of gas, but yet we wont use a part that BMW recommends for the engine? 
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Profeshenal spellar
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#34
10-20-2009, 02:59 AM
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According to the NGK site, the PN for the 4.6is plug is BKR6EQUP, and 3199 is what they refer to as a "Stock number". These sites all suggests the NGK BKR6EQUP is the same thing as the BMW OEM PN - 12129071003. In other words - the 1212... is the BMW PN and the BKR6EQUP is the NGK PN. Doesn't seem to me there is anything different about them other than when BMW sells them they charge double the price. BMW Spark Plug "High Power" NGK BKR6EQUP (3199) 12129071003 - RM European Auto Parts NGK SPK PLUG BKR6EQUP (12129071003) 3199 NGK Multi-ground Plug. Part# BKR6EQUP Case of 120 (3199, BKR6EQUP, N123199, NG3199) | Audi Reports NGK 12129071003-220 for only $10.36 from KO Performance BMW Spark Plug E46 All except M3 12-12-9-071-003 / 12129071003 - Bimmer Parts Web I guess I could call NGK North America just to be sure. But I really don't want to throw away over $100 for no reason if the BMW PN is exactly the same as the NGK PN. That is pure profit for somebody the way I am reading it. I'd rather not support the economy in that fashion. I'll spend it somewhere else and spread the love around instead!!
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2003 4.6is - SOLD 2003 M5 Imola 2008 Mini Cooper S 2011 Mazda CX9
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#35
10-20-2009, 03:16 AM
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12129071003 is a BMW PN, not a NGK PN. BKR6EQUP is the NGK PN. besides, I have had many race/street engines including one 540hp 11:1 CR 383 SBC V8 that ran great with $3 autolite spark plugs. There is really nothing magic about a spark plug as long as the heat range is correct and the tip design is compatible with the head / piston configuration. I also know a little about mfg, and it seems very unlikely to me that NGK would make a special variant of a plug for an OEM and still sell it under the same NGK PN as the regular plug. If Bav Auto listed it under only the BMW 1212... PN, then I could buy the argument there is something different about it. But since they list both the NGK PN and the BMW PN that is further evidence that there is only one plug, and there is a BMW PN for it and a NGK PN for it. Interestingly enough, I looked up the NGK plug for my S4 and turns out it is the same PN. haha!! That is funny. Although for whatever reason you need to replace them every 60K miles. I think I went with the Bosch the last time I changed them. Note there is also an Audi PN listed, but the same NGK PN: Audi S4 Spark Plug at Auto Parts Warehouse
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2003 4.6is - SOLD 2003 M5 Imola 2008 Mini Cooper S 2011 Mazda CX9 Last edited by c4racer; 10-20-2009 at 03:26 AM.
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#36
10-20-2009, 08:12 AM
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I don't specifically know about this example of BMW and NGK part numbers, but as you know about manufacturing, you will have experience with manufacturing lot numbers. The part in your hand is described by a part number, but it is also part of a specific manufacturing lot. In my industry, we have the same situation as these spark plugs, often with bearings and other similar parts that are outsourced. We use engine manufacturer numbers for replacement bearings, and you can often get the same bearing from a bearing manufacturer, using the reference number stamped on the bearing. The difference can be that a part fails a QA test, and that entire lot is discarded or simply not accepted by the engine manufacturer. Even if it isn't accepted by the engine manufacturer, it may pass the internal inspection, and thus can be sold under the original part number by the outsourcer. It can then end up on Amazon.com, and it very well may be fine in use. I don't know that this is the situation with NGK plugs; I like NGK plugs, and I use them, but them having the same part number as a BMW-sold item really just means they have the same thread, reach, and heat range. They may not be produced in the same factory, with the same QA process, or with the same inspection results. Given the damage I have seen inside performance engines from spark plug failures, I would just use the BMW part number. It isn't a guarantee, but it does offer some form of risk mitigation IMO. Just my $0.02
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue Last edited by JCL; 10-20-2009 at 09:34 AM.
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#37
10-20-2009, 09:48 AM
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OK...I just called NGK's technical support. The rep. basically told me that the OEM NGK plugs, which are more expensive, will typically last 80k-100k miles and are laser platunim with 4 nickel grounds. The cheaper NON-OEM iridium plugs typical life is 40k-50k miles and have 1 ground.
He said that the iridiums will actually give a very slight performance advantage, but at the expense of a much shorter life. So c4racer, you can buy those plugs from Amazon and save money now, but you will have to replace them twice as often. If you don't change them yourself, I would bet the cost to have them replaced negates any initial savings. Hope this helps.
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Profeshenal spellar
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#38
10-20-2009, 11:28 AM
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FSETH,
The question isn't really the difference between the OEM NGK plug and iridium, it's whether the BMW branded NGK laser platinum BKR6EQUP (BMW stock #12129071003) = NGK branded laser platinum BKR6EQUP (NGK stock #3199).
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#39
10-20-2009, 11:46 AM
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Spark Plugs
Hi All,
Unfortunatley I dont have much input on the subject. I am actually getting to get an oil change for my 2002 X5 3.0 with 45K miles. Just wanted to confirm based on the INSPECTION II that I should be changing my spark plugs at this time. If so I will probably go with the NGK spark plugs based on everyone's threads. Any feedback would be appreciated. Thanks Steve
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#40
10-20-2009, 11:48 AM
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Quote:
__________________
Profeshenal spellar
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