Is 7500 the most miles you guys would wait to change? On the Amsoil website it says its good for 10k. Just wondering. Trying to understand the cost differences from dino to synthetic and decide if I want to switch. Pretty sure I am going to, but I'm a numbers guy....
Mitch,
Check out this thread. http://www.truckmodcentral.com/forums/showthread.php?t=1959
Andy had his oil tested and Blackstone said it was still good and could go past 10k if he wanted to. Check out post 38.

