Short answer, flog it on E-bay and do what Rob says, if you've hammered your car to within an inch of its life and then you need to let the whole car cool down with air circulating through all the bits (Brakes/tyres etc) too, not just idling on your drive.
Long Answer, I was reading that old turbos didn't have any water circulating so the bearings used to get hotter and when the engine was switched off the (old) oil burnt on the bearings coking them up. By manufacturers adding water cooling to turbo's, the problem of oil coking the bearings was basically solved by using the water as a secondary heat sink.
This is also why you don't see manufacturers installing turbo timers on turbo'd cars and still getting good reliability. This is what I read anyway but it makes sense to me. Open to comments from wiser people