[ArmyJeff]

The car/engine does have about 120k on it, and the turbos are most likely original. The engine is running fine from what Ic an see. No knoack or anything and all injectorsare firing,etc. It runs but when I get the boost close to zero it grinds and white smoke comes out of the exhaust until I let off the gas. If it were the block or head gasket, wouldn't it smoke the whole time, not just when the turbos spool up. The grinding is clearly from the rear turbo, not the front. Haven't checked for shaft play, but I did hear that the o-ring inside the turbo goes bad and oil and coolant leak into the housing and cause smoke?!! Anyone else hear or have the same issue? Thanks for all the help. I am about to get a set of turbos from DR if the turbos are the problem.