OK. it may be that I'm not fully aware of my own driving habits; I shift between 3500, and 4000, under normal conditions, and sometimes (going up a big hill, getting onto a highway) I'll get it up above 5500, but I never keep the RPM up too high for more then a few seconds. Is this "rigorous" driving?


EDIT: I guess a better question would be, with better oil, CAN I run it harder?