... keep the turbine shafts physically moving during cooldown to prevent "spindle droop" & subsequent bearing failure. The hardening of burnt oil - coking - is the biggest potential problem. It's nice that coolant is recirculated after shutdown, but that's hardly enough.

Regardless of what the naysayers have to... err, say, do a turbo timer. They're cheap & simple to install... & those w/ hardworking turbocharged cars have been using 'em for years.

My $0.02: cheap insurance.

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2000 1.8T quattro "OEM+"
GIAC Borla AWE EvoMS ECS ATP Samco APR B&M H&R CPP Valeo SPP RS4 MOMO VDO Nukkin'Futz