Quote:
Originally Posted by Irace86.2.0
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?
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I've read (but I can't remember where) that oils tailored to perform better at temperature extremes break down faster. ie That a 0W-50 oil fill breaks down to be something more like 10W-30 pretty quickly due to long-chain hydrocarbons shearing.
So I wonder if Subaru's thinking is along these lines - that a 5W-30 has greater longevity than a 0W-30?