Originally Posted by reide181
Would you recommend 5w-40 Rotella T6? For some reason all the Subie guys around here live by it. But it's against the recommended weight on the Subaru cap and it's typically used in diesel trucks so thr doesn't sound like the right option but of course I know nothing about oil. I do drive about 50% "spirited" at mid to high rpms.
Its more of a personal opinion, but I believe Rotella T6 would be as good as any fully synthetic oil on the market (Pennzoil, Castrol, etc).
I believe Turbocharged guys need the 5w-40 because Turbo'd engines run at higher idling temps than we see in a N/A car. Without the ability to maintain efficiency of the oil viscosity, it can cause major damage to the engine.