I was the at dealer yesterday getting a new rear window regulator and when they did the normal check of the car the mechanic said my drive belt is starting to show cracks and I have a slow oil leak (need to replace a valve cover gasket). I have an '01 3.0 with 83K miles---I did the belts 2 years ago at an independant shop and only have 18K miles on them. Do they get replaced that quickly ? And how major is a slow leak in the valve cover gasket ? I plan on going to an independent shop when it's time to do them but not sure if I have to do them right now, etc.