Has anyone gone the full 7500 miles before the engine change oil light comes on?. I am going to try to go with the schedule that the book says to do, my 05 had 5000 mile changes, what I don't want to do is be at 4000 miles and leave on a trip to have the light come on when I am 100 miles out, I do all my own service, and this truck is used 100% to tow the 5th wheel, plus some local driving when away on trips, it is never used a a DD or grocery getter. I would just like a little feed back on what others are getting, thanks