Quote:
Originally Posted by DarkPira7e
I only suggest not going thick because you're asking about the winter grade. Your oil is still lubrication on a cold start. A 5 winter oil is thicker when cold than a 0. When cold. Cold. When your oil heats up, it has the viscosity of an SAE grade 30 oil were it a 0w30 or a 5w30.
If the turbo doesn't affect your cold temps (which it doesn't) you wouldn't want to make cold oil thicker right?
**EDIT**
just realized you changed the 20 to a 30. That's the only place you'll find merit is increasing the warm grade. A 0w-30 would be ideal..
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Still, and yet, Subaru recommends 5w30 on their turbo engines. Why do you think that is? I mean really, why?! I don't know. Is it because 0w30 is hard to find or is more expensive?