I took the boat down to the marina to run it and get the oil hot for a oil change, I only could hit 2000 rpms, no power turned around and back at the dock my compressor fins wouldn't spin. I took the turbo to a shop and they diagnosed the problem I went to the shop on monday and visualized the crack and could see where the fins had been rubbing, as well as the shaft was starting to groove. He said poor maintenance (oil changes) typically leads to this, dirty oil getting between the shaft and bushings. E.,