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In Reply to: Re: And which one is the best ##W-## for M3s?? (eo posted by Jon Caldito on January 09, 2000 at 07:10:09:
: Depends mostly on location. 15w-40, 10w-40, some people use 5w-40 and under road racing conditions, it's 20w-50 or straight 40 or 50 oil.
when you straight 40 or 50, do you mean 40w or 50w? if so, isn't that a bit thick for an engine and is more suited as gear oil?