Was wondering if any of you guys had luck in the MPG arena after changing your front and rear diff oil to an aftermarket Syn Diff oil (ie: amsoil or the like). any thoughts or experiances would be appreciated. I have just over 55k on my rig now and was looking to change the oil soon anyway to swap to Syn and maybe add covers with cooling fins while i was at it. Just trying to make the Drops of Diesel go further....

 

I'm doing mine real soon too. Putting Amsoil 75-140w in the rear (since I tow a camper during the summer) with an 08+ rear diff cover (it's a finned aluminum job from the factory and less than $100). For the front, it's getting Amsoil 75-90w.

I'm not expecting an ounce of mileage though...

You think if I wax my truck I'll get better mileage?

 

hahaha

 

I'm running amsoil front and rear.

no mpg change..

Try the wax