Quote:
Originally Posted by pkim1079
The other problem i see is this ... 60 is too thick when the engine is cold but when warm is good. On the otherhand, 40 is good when cold but does it get too thin when hot (track days)? Thats where it is an unknown for me.
Excuse my grammar as im on the phone app  |
M 0w40 is widely used as a streetable race oil. Even Mobil says that's what it was designed for. Factory fill on the AMG models, Viper, GT-R, etc. Also used as a spec-oil by some spec-racing series. Aston Martin uses it straight from the bottle in their LeMans cars.
300 F on that oil on the track is just fine.
Being considerably thinner than TWS (HTHS 3.8 versus 5.2) means it will actually run cooler. The higher VI (185 vs 173) also means a lower change of viscosity with temperature, which is a good thing. We already know that the bearings on these cars have issues squeezing oil through due to some crazy tolerances, so why run something even thicker than necessary?
As I've repeatedly posted: "as thin as possible but as thick as necessary".