I have oil leaking from my 1989 200 Quattro Turbo. It seems to be coming from the turbo itself because I can find oil inside it. No smoke yet, but I think the turbo's internal seals are going and we are headed in that direction. Can't afford to buy a turbo from Audi. What are my alternatives in buying a rebuilt one or rebuilding this one? I'm located in the Delaware Valley near Philadelphia.