Just wondering for all you GTO owners, do all the GTOs require high maintenace? Meaning alot of prevenative maintainence. Reason I ask is that one of my friends at work was talking about the BMW M5 and saying that it requires alot of prevenative maintenace and be prepared to spend some of your weekend keeping it maintained. The M5 and GTO are very similar in horsepower. So my question is do most of you spend a great deal of time maintaining this car? If so, what kind of things do you do?