[DarkPira7e]

Originally Posted by Irace86.2.0

OEM turbocharged Subarus use 5w30--not 0w20. Why would 5w30 not be the minimum? Then he could use thicker oil if there are serious track days.

https://www.patriotsubaru.com/synthetic-oil.htm

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..