Peter, I am sure as you know that not changing the oil is the reason for turbos going south as they do. If I knew of a car that had been properly maintained I wouldn't have any problem with it but then who knows . I guess the turbos are capable of being overhauled such as the 911 Porsche turbos. You being a DIY could take care of that if it became a problem. Something tells me though that the GT4 has too much of your blood and sweat in it to get rid of it. Magoo