[Quicksilver]

You can shift at 3500 but you shouldn't really lug the motor. This is way more important with an earlier car. The Motronic cars aren't as predisposed to problems from not driving the car hard so we can get away with a bit more. (but why would we want to?)

A decent rule of thumb is to not cruise at less then 3K. It doesn't hurt to at least wring it out once on each outing once it is warm. A good charge to redline will help keep the carbon deposit monster away.