[cep]

On the general topic of turbo lifespan--turbos are not particularly delicate. About the only thing that none of them can survive is inhaling foreign material--that damages or demolishes the intake rotor instantaneously. The oil coking issue is largely overblown. There are hundreds of thousands of turbo vehicles which never get any kind of a deliberate cooldown period and make it all the way thru their expected lifetime without failure, and that is with conventional oil. Virtually every diesel truck on the road has a turbo that is flogged harder every day than the VW turbo will be in a year. About the only time we ever gave them a cooldown period was if we stopped at an interstate rest stop on the crest of a hill. Any other time, maneuvering around to get parked was enough time to cool the turbo off and we never had one fail due to coking and that was with dino oil.

Before one says, "yes, but, the VW turbo is different"--yeah, they are, but the only real difference is size. They all have an intake and exhaust turbines on a common shaft, either bushing or ball bearings and intake and exhaust scroll housings. They're really a simple machine but built to very close tolerances.