I used Amsoil in my last truck, switched the front and rear diff over to amsoil gear lube at 45K due to towing a boat often. Wanted to put in the best I could get. both changed at 25K at dealer for the first go round.
At 55K I replaced the rear diff seals due to leaking, and at 66 I replaced the right front diff out board seal for pass axle shaft. When I traded the truck at 80K the driverside front was leaking.
I won't use this product again. It may be awesome but isn't very friendly on factory seals, as it seems to get past them easier