Hello together, I drive a Viano 3.0 with the OM 642 with 224 hp. The engine has been replaced times and should have a mileage of almost 100 000 km. The turbocharger was also replaced during engine replacement. Whether a new or outdated was installed, I can’t tell. When buying the charge air hose, which leads into the charge air cooler, leaked and there have always been oil drops formed. I changed the hose, but the oil can only be replaced by the turbocharger do Since the car has no noticeable oil consumption, I was less worried about it, especially since I know about the oily charging air hoses also from my W203 C270. What worries me more is a quiet whistle under load from almost 2000 revolutions and grey/black clouds while accelerating. The charging pressure, measured with Delphi, was yesterday at max. 2.44 bar and I don’t feel that power is missing. Should I worry about the turbocharger? Thank you!