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I think People are getting confused between petrol and diesel turbochargers, there to differnt animals.
petrol turbos run at much higher egt's (exhaust gas temperature) then what diesel do, so the core of the turbo does not get as hot on a diesel(still bloody hot though) so it's not so susceptible to the oil sitting on the bearing after the engine is switched off and heating up and turning into carbon deposits(this is what kills them)
As potts has said the best thing to go is take the last mile nice and easy, i would not leave it to ideal to long as this is where a lot of engine wear can occur(low viscosity and low oil pressure)
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