Do you have data to substantiate your claim? You haven't seen any that maintain virgin viscosity in a 1.8t? Have you tried all of them and had a UOA done? You picked some pretty good oils to make such a bold claim. I have read about the M1 0W-40 shearing to a 30, but that's all I've read, and seen data on. Motul 8100 E-tech (Grp V ester based), or others aren't shear stable? Show some proof. I find that very hard to believe.quote:
Out of the commonly available oils in the U.S. that literally have 502.00 approvals, I haven't seen any that maintain their virgin viscosity in a 1.8T. These include Valvoline 5W-40, M1 0W-40, Pentosin 5W-40, Lubro Moly 5W-40, Motul 0W-40, Motul 5W-40, Syntec 5W-40.
---->I meant your 1.8t.quote:
At the same time I see you're using castrol 5W-40. A dino in a turbo, if your 9-5 is a turbo? Not to start a big debate, but if one were worried about turbos, heat, and shearing...Castrol 5W-40 psuedo-synthetic (A group III perhaps) would be last choice.
Well, I use M1 5W-40 in my Audi despite the lack of VW 502 approval, but Gilitar specifically asked for a VW 502-approved oil.quote:
Does anyone think M1 5W-40 isn't equal to or superior than those oils listed by moribundman?
If I go to the US Mobil site and check what oil they recommend for my '96 Audi A4 (VW 500.00)they tell me M1 0W-40 or M1 15W-50 "may be suitable." But they don't commit.quote:
Could the reason for the lack of thse ratings for M1 5W-40 simply be Mobil's marketing plan? ie, they've got their "European Car Formula" 0W-40 that has all those specs, and while the 5W-40 in all likelihood meets or exceeds the same requirements