Does Friction Modifier Need to be Added to AMSOIL Gear Lube?
Updated- September 2025 A commonly asked question by those with vehicles equipped with a limited-slip differentials is, “Do I need to add a limited slip additive (or friction modifier) when changing to AMSOIL Synthetic Gear Oil?”. Our answer is a qualified “yes”, but please read on. All AMSOIL Synthetic Gear Lubes for automotive applications have…



