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Originally Posted by gatorfast
So BMRLVR, you recommend a lower weight for engines that don't see high temps. But what about engines that see higher temps (at least 100c) every day? Living in south Florida where it is 90+F year round my oil temp gauge is in the middle or slightly past every time I drive
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People seem to be misunderstanding what I have been recommending! I didn't mention cool temperatures at all as a factor for using light oil...... Obviously in cooler climates it would be even more important to use a lighter oil....... What I am recommending is using lighter oil in the M3 period.
The clearances on the rods of the S65 are so tight that the 10W60 just doesn't make sense for anything but all out balls to the wall track driving! It is my opinion that the majority of the rod bearing wear may be as a result of oil starvation due to flow restriction of the TWS before it gets to operating temperature.
The M1 0W40 really is a stout oil and it is certified by Porsche, AMG and Nissan (GT-R) for use in their high performance engines that are just as or more demanding on engine oil than the S65. Porsche and AMG are two of the strictest automakers with regards to oil requirements for use in their engines!
Personally, I would have no problem using the M1 0W40 year round regardless of outside temps. I would even use it for track days without batting an eye. It's HTHS # of 3.8 it is quite stable when temperatures rise.