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#1 (permalink) Old 04-02-2011, 08:35 PM
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spark plug gap

I have a 1990 525I touring wagon. According to the owners manual, the spark plug gap is not in there for the 525i, the gap for the 535i and m5, but not the 525i. Can anyone give me insight, or a gap i can use? the book has the 535i at 0.7mm + 0.1mm or 0.028+0.04in
and the M5 at 0.6mm+0.1 or 0.24+0.04in
the book has the recommended plugs to use for all three cars. I have the plugs, but I need to know what to gap them at.
The motor is a straight 6 if that helps any.
Thanks in Advance
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#2 (permalink) Old 04-03-2011, 01:03 AM
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Which plug di you have? (to better answer the question)
Are they the Bosch W0133-1809379...
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#3 (permalink) Old 04-03-2011, 08:39 AM
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Quote:
Originally Posted by Moose View Post
Which plug di you have? (to better answer the question)
Are they the Bosch W0133-1809379...
no i got the autolite xp iridium from auto zone. come to find out they dont carry bosch for this car. i had called back to try and get a gap for the plug and asked about the bosch and ngk plugs
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#4 (permalink) Old 04-04-2011, 11:43 PM
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Hmmm...I don't know how comfy I would be putting "Autolite" plugs in my BMW. I know my local O'Reilly auto parts caries the NGK's. They run just under 10 bucks a piece and are pre-gapped. The NGK's have (4) ground electrodes per plug. The Autolite's only have (1) per plug. If you have not put them in yet, I would really advise getting the NGK's (OEM) The increase in fuel economy and engine performance is worth the extra 12 bucks. I gained 4 mpg just changing out my old NGK's to new ones. I have yet to see a fouled plug in a BMW when the OEM's were used. I have replaced countless numbers of aftermarket and USA branded plugs that were fouled, and causing poor performance/decreased fuel economy. JMHO and years of owning and repairing late model BMW's.
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#5 (permalink) Old 04-05-2011, 04:06 AM
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thanks for the info, i think i will take these back and go to o riellys to get the ngk or see if they have the bosch. the bosch that are in there look pretty good, but i just got this car in dec and it has over 220k, im tryin to get more mpg and power. thanks again
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