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It's metal, oil, and heat. Not much you can do about it.
P.S. Don't race people when your engine is cold. I care way more about my engine than impressing some loser who wants to race. Most of the time I find that people looking to race have slower cars than mine anyways. Even if their car is faster... who cares?
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E92 M3 | Jet Black | All OEM Everything
E30 M3 | Alpine White | Mostly OEM |