Wouldn't you use the same weight for turbo superchare or na? You should also take in consideration your bearing clearances when choosing an oil weight. Turbos require little pressure for oiling, which why (ball bearing) use a restrictor. Even some journal bearings should use one depending on their oil pressure from the motor. I personally saw a precision 6266 journal, -4an feed with no restrictor completly fall apart from the bearings inside.
The rotella contains zinc additives, same with brad penn, which is great protection for motors. (bearings, cams, rockers etc)
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