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OP, sorry to be harsh here, but if you knew about the Supplement manual and you knew that the M3's engine isn't anything like the base 3 Series engines, why on earth wouldn't you have checked the Supplement FIRST on the assumption that maybe there are different guidelines for the M3? The Supplement always takes precedence when it has overlapping info, so the only time you should be looking at the regular manual is after you've confirmed that the Supplement doesn't address what you're looking for.
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