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#12
10-16-2009, 10:47 AM
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It's my belief from past experience owning an RX-7 Twin Turbo that the Bosch plugs w/ multi-tips were mostly designed for rotary motors due to how fast the rotary can rev. It needed multiple points for the spark to be able to reach so it could ensure that the revs didn't blow out the spark.
The M62TU is by no means an 11k rpms revving monster, so I'd personally pass on the Bosch's. NGK Iridiums all day long, 50-100k intervals...the world is a happier place 
__________________
 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; 11-11-2009 at 04:24 PM. 
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#14
10-16-2009, 07:06 PM
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Good info in this thread. Will keep that in mind for upcoming spark plug change. (is it at 60k miles? if so, I am almost there.)
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Currently driving: 2011 E70 x35i , 2011 E90 335d Previous BMWs: 2007 E90 328i , 2005 E53 3.0i, 2011 F10 535i (6spd manual)
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#15
10-16-2009, 07:40 PM
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Quote:
 My guess is that the 4417's run slightly hotter. In any case, NGK BKR6EQUP here.
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Previously owned: '03 4.6iS Dinan Supercharged
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#16
10-17-2009, 12:08 AM
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I'm running the NGK Iridiums as well. I swapped out the OE BOSCH @ 88K miles.
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---------------------------------------------- 2006 X5 3.0L - Schwarz Black/Truffle Brown Stock But I keep it clean 
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#17
10-17-2009, 01:32 AM
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Quote:
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Profeshenal spellar
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#18
10-17-2009, 11:16 AM
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NGK Iridium IX's can be had for less and perform better than, if not the same as, the Platinum OEM plugs.
NGK Iridiums Here as well.
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#19
10-17-2009, 03:28 PM
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im jumping on NGK bandwagon as well never had a bad experience with them
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#20
10-17-2009, 04:50 PM
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The plus side to Platinum is that they don't erode as fast, satisfying the dealer service intervals. The down side is they don't transmit as hot a spark as copper or iridium. In a non-performance motor, I'd choose copper. In our motors, definitely Iridium.
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---------------------------------------------- 2006 X5 3.0L - Schwarz Black/Truffle Brown Stock But I keep it clean
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