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If you P&G (engine off) you are going from a significant impeller speed to basically nothing fairly quickly. While you jsut shut the engine off the turbine impeller could still be spinning at 20-30,000 RPM. Although you have shut off the heat source (combustion) you have not shut off the heat transfer.
Now you have a very hot turbo, with the shaft spinning rapidly and it is very hot, but you have eliminated the oil flow and coolant flow (if water cooled). Even with a high quality synthetic oil, you have a recipe for failure, a situation way outside design parameters.
regards
Mech
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