It used to be said a turbo engine should be left idling before switching off. The idea was that while the engine is idling, oil continues to cool the bearing and the turbine cools down, too. Otherwise, stopping the engine halt the turbo’s oil supply while it’s still running down from high speed, and while heat from the exhaust is still soaking through the shift and casing. That caused bearing and seal damage, and carbonized the oil into vandalizing grit.
That’s not strictly a problem on a modern unit post 300TDI, but it’s still worth lettering a turbo engine idle for a few seconds after it has been heavy towing. The turbo won’t be damaged by switching the engine off immediately, but its life may be reduced.
Make a habit of starting your engine, then putting your seat belt on, and taking your belt off before stopping the engine. Those few seconds will ensure oil flow to the turbo before driving off, and sufficient cooling before switching off.
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