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My $0.02........I don't think the turbo is water cooled, oil cooled/lubricated yes. I believe the exhaust ports in the head are water cooled, to cool exhaust temps somewhat.
Since the turbo is driven by exhaust gas, I would think the turbo heats up really quick. It is a good thing to allow enough time after start-up to allow engine oil to be circulated all the way to the top of the motor, which would include the turbo, before driving off.
From a cold start, I wait until the engine rpms drop to 1200-1300, then start to drive easy until engine heat starts to rise. I would think it takes less than 1 minute for oil to be circulated to the top of the motor form a cold start. Driving will warm up the motor quicker than idling.
Again, my $0.02.
Since the turbo is driven by exhaust gas, I would think the turbo heats up really quick. It is a good thing to allow enough time after start-up to allow engine oil to be circulated all the way to the top of the motor, which would include the turbo, before driving off.
From a cold start, I wait until the engine rpms drop to 1200-1300, then start to drive easy until engine heat starts to rise. I would think it takes less than 1 minute for oil to be circulated to the top of the motor form a cold start. Driving will warm up the motor quicker than idling.
Again, my $0.02.