Quote:
Originally Posted by jcp123
But the turbo bearings are still oiled, no? That's where the oil-cooking happens.
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Sure. But nowadays some design improvements can be applied to newer turbochargers and its bearings in order to minimize the occurrence of oil coking, and also the specifications of lube oils have changed a lot. I have already seen many older vehicles retrofitted with a turbo and no supplementary oil pumps without any sign of oil coking into the turbo bearings.