Choices for a synthetic API SM for a turbo engine?

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Weaknesses in Mobil 1 5w30 in Subaru WRX engines may explain why Mitsubishi says to only use 10w30 in the Lancer Evolution 9, and engine that probably sees similar or even more stress than the Subaru.
 
I figured that its not worth the chance...even my NA 2.5L responds well to 5w40. I know a lot of people said not to run anything "lighter" than 5w30.

I think a lot of those 5w30 recommendations are based on CAFE numbers, and not longevity.
 
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