VW must be using a pure sh_t turbo. My parents old 1988 Mazda 626 GT is still on the stock turbo with 210K miles, motor never rebuild. 3 radiators yes (plastic endtanks suck), but no other motor work done. IHI RHB5 VJ11 was the turbo. Water and oil cooled.
If VW uses such crap turbos on the TDI's, I'm inclined to remove it and replace it with a better known reliable turbo. No reason to replace failing components with another one that'll fail in the same time period. Upgrade to something more reliable instead of wasting money on maintenance.
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