Does this turbo have the adjustable exhaust veins? If so, there is a cleaning factor involved. The question is, what were they actually cleaning out... filings or soot build up from poor quality fuel or build up of soot due to oil seal leakage. If it is the more standard turbo then, yes, the boost machanism can seize up. One of the oiling system problems was a composite gear in the high-pressure oil pump that would shatter. You must do a complete tear-down to get all the left over pieces out. Some of those pieces would lodge themselves in the injectors causing them to fail. All remaining pieces did even more damage in time. Hope this helps you. Also try powerstrokehelp.com.
