I don't think you will be averaging six hundred miles a hour on your four hour trip so you won't go over, and so what if you do.

nope!! as long as the oil is up to the full mark.

I would change to AMSOIL the Best 100% Synthetic in the World. AMSOIL goes 25,000 miles on the same oil and filter as well as giving you a 6% savings in fuel.

I would. Read this about oil life

http://ricksfreeautorepairadvice.com/whe...

ONLY IF YOU ARE GOING TO EXCEED 652 MPH.