Like everyone else has said, you arent supposed to rev above 3500 in neutral/park. my Mom's grand Prix doesnt allow me to. Anything over 4K rpm's is extensive wear to the engine, and by extensive I mean it does more wear then you average take off from stop. Its why I want to get a tach, cause sometimes I have to take off hard to get into traffic, but I dont want to push the engine to hard.
