Turbo, synthetic or mineral oil?

[CliffS]

Turbo's seems to like synthetic oil but the dilemma is does a fresh sbc likes it too?
The SBC has been totally rebuild, crank, cam, pistons, alu heads etc. The turbo is a martin turbo system rajay turbo.

[wicked68]

Turbo's seems to like synthetic oil but the dilemma is does a fresh sbc likes it too?
The SBC has been totally rebuild, crank, cam, pistons, alu heads etc. The turbo is a martin turbo system rajay turbo.
I have been told not to run synthetic in a forced induction engine. not sure why....

[GetMore]

I would run synthetic with a turbo. It handles the heat in the bearings better and won't coke up.

[DeltaT]

I run a synthetic in my blower motor, but for a turbo I would run Shell Rotella 15W-40. No use running an expensive synthetic when turbos like frequent oil changes, like every 3000 miles. A good, non-synthetic doesn't have time to breakdown with those types of change intervals.

Jim

[MonzaRacer]

Forget that synthetics dont mean longer change intervals, I wish EVERY Amsoil salesman was shot for that garbage idea. Maybe open intervals up to 4k but thats with lots of highway time.
I ran 15w50 and 5w40 synthetic in roller 350s and tried to keep to the 3500-4000 oil change, cant knock Rotella !5W40 but certainly would never try to extend oil changes over an engineered oil over a "cracked" oil,,,, both actually come from dinosaurs but the synthetics molecules are simply engineered to be the same and to be more stable.
Contact your turbo manufacterer ot Tims Turbos for more info.
Lee Abel
AFTERMARKET PERFORMANCE

[turbo69bird]

Turbos can be run on either oil. They do require two things though, more frequent oil changes due to heat and to let the engine idle for a few extra seconds before killing the engine.

Coking happens mostly when a hot engine /turbo are driven in and shut off quickly without time to cool the turbo. it simply cooks the oil thats not circulating causing coking.
While synthetics may not cook as easily the key is to cool the turbo for a moment before shut down.