Quote:
Originally Posted by fastfrs
on a dd/track car... amsoil or motul? 0w-30?
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Tough call IMO. There isn't any/much
data to determine what a good viscosity to use at the track is. If you're looking at 0W-20, either would be good choices at may produce similar results and have similar levels of protection.
If you're considering 0W-30, I would definitely choose the Amsoil over the Motul if you have stock internals. Motul's 0W-30 is a high HTHS and high kinematic viscosity oil and will nearly function like a 40 weight.
OTOH, Amsoil SSO 0W-20 and Motul Eco-lite 0W-20 have the same kinematic viscosity (Motul doesn't list HTHS on Eco-lite). The Amsoil has a higher TBN so it's probably safer to run a bit longer, but the Eco-lite's ester's probably provide a bit of anti-wear (although it's thought that Amsoil 0W-20 uses ester's, but it's not listed on the bottle).
I would probably pick a 0W-20 and do a couple of used oil analyses and decide from there. Or you could just go all out and use a race oil like Amsoil Dominator 5W-20 or Motul 300V 0W-20. For the track, I would pick higher levels of anti-wear additives and friction modifiers over a higher viscosity any day. You would just need to do a uoa if you intend to run either oil past 3,750 miles, or seek advice from directly from Amsoil and Motul.
-Dennis