Quote:
Originally Posted by Tambohamilton
Why/why not?
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0W30 TPT is FE oil (Fuel efficiency). High Temperature High SHear (HTHS) is around 3, compared to TPT 5W30 which is around 3.6.
Since 0W30 is API SN oil, it means ZDDP levels are not above 900ppm. TPT 5W30 is loaded with ZDDP at around 1150ppm.
Take into consideration that BMW N engines run oil temperature at around 109c to 115c in normal driving. At that temperature 0W30 is actually turning into W20 oil.
IMO, on track, always W40 oil, but if one is going with W30, go TPT 5W30.