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Originally Posted by MNBoxster
Hi,
The issue between Super/Turbo was that the Supers usually have an independent Oil supply, while the Turbo generally shares the engines Oil supply.
If you simply shut the car down, the Oil flow around the turbine bearing stops and the Oil in the Bearing Housing will superheat and turn to Coke. This Coke, a form of Carbon which when cracked from Oil produces a granular form which is pretty hard can be pretty destructive. These coke crystals will then flow through the engine causing excess wear (think sand flowing through the engine).
Many turbo cars were equipped with cool down circuits, which continued to run the car at idle a few minutes to remove the Heat from the Bearing Housing until it was below the critical threshold where Coke formation took place. Or, owners allowed the car to cool down by allowing it to idle several minutes before shutting it off.
But, with Synthetic Oil, Coking is largely eliminated because of the Oil's greater stability at high temps. This prevents a breakdown into Coke. Hope this helps...
Happy Motoring!... Jim'99
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That is only true of some superchargers. Vortec Superchargers use oil from the engine via a feed and drain line. We use procharger units, which are self contained oiling systems so we don't have this problem.