RockySierra wrote:Your truck will not last any longer just by simply running amsoil or some other "premium" name oil in it. Spend your money wisely. Transmissions with the exception of the Allison are not built to last 200,000 miles unless you are doing a ton of highway driving.
The 4L60E in my 97 Sierra had roughly 300,000 miles on it, and had no issues whatsoever when I traded it in for my current truck. I know for a fact that the 4L80E will last longer in my current truck now that it's full of nothing but AMSOIL, than if I hadn't changed over to AMSOIL. Why? Because it has reduced the operating temps, and smoothed out the operation of the transmission. Since I do a lot of plowing\towing\hauling, the less heat and roughness I see from the transmission, the longer it will last.