Looks like I'll need a new turbo for my AQAD31A in my Blackman 20. I had Custom Turbo Rebuilders in Santa Fe Springs look at it and Jeremy said that once you start getting rust on the exhaust side, they're done. If they tried to clean it up, you increase the clearance and lose boost.
Custom Turbo Rebuilders quoted me $850 for a new turbo. He buys from a distributor for the manufacturer, KKK out of Germany. The turbo model is a K26. How much does Volvo charge for these turbos?