Originally Posted By: bullwinkle
Castrol Edge EP 0W20 PP is -38F, M1 EP 0W20 is -54F. Looks like the M1 (at least in 0W20) has more PAO-but only your engine, and UOA trend, will really know for sure which one works better for you, I wouldn't have any issues running either one to 10K in a clean engine.
Like ArcoGraphite said above, M1 EP 0w20 does have about 65% PAO (confirmed; I saw the SDS too).
Clever way to compare. Comparing Castrol Edge EP to Mobil by pour point should work well.
Castrol Edge EP 0w20 is actually listed as -43 deg F (not -38F, that figure is for black bottle only).
https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/2E0C74C068F96EFC8025814C005E6D47/$File/BPXE-ANUM3J.pdf
I found an MSDS on Edge black bottle 0w20, not their EP one, and it is indeed all GroupIII, no PAO... no surprise.
And Castrol Edge black bottle has a pour point of -38 degF.
Could be Castrol Edge EP gold bottle has very little PAO, based on the pour point comparison (black bottle to gold bottle Edge 0w20's).