> <<The old 911 needs the heavier M1 - 15W50 preferably. 0W40 works for > '90-present but before that the tolerances are just not tight enough. The M1 > website recommends 0W40 for all the Porsches regardless of year. > > Let me know if you have any questions or comments ->> > My question is, where does this recommendation come from? Porsche issued a service bulletin years ago recommending M1 0W40 in every one of their engines back to 1973.5. Which was the first year for CIS in the 911T.
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