I have two non-diesel mechanics telling me that my Turbo is shot and seriously leaking oil. They say that the engine should be cleaned so that future leaks can be detected. Volkswagen dealer is telling me that to clean the engine which is 6 years old, will cause more problems with the engine than it will solve. They say that the turbo is fine, yet the area around the turbo is oil soaked. The engine is loud, has had the tensioner replaced, and has remained loud. Who should I listen to about having the engine cleaned. Any help will be appreciated.