What is the best rear diff fluid to go with.everone is tellin me royal purple 75w140 but I know ford recommends 80w90.what do you guys suggest?I have a 98 cobra stock rear end no gears
What is the best rear diff fluid to go with.everone is tellin me royal purple 75w140 but I know ford recommends 80w90.what do you guys suggest?I have a 98 cobra stock rear end no gears
Pretty sure its Shell. Mopar is a middle of the road fluid. I wouldn't use it.
Royal Purple is the most unstable gear oil you can buy. Even worse than Lucas. Both have been shown to lose 35%+ of their viscosity after shear testing.
Amsoil and Redline sheared only 3-5% in the same test.