Friction Modifier Additive 150ml. About Friction Modifier Additive 150ml. 150ml of Friction Modifier Additive will treat an axle with up to 2 Litre capacity, for other capacities refer to technical. Friction Modifier Additive is a synthetic limited slip additive, designed for use with hypoid gear oils to alter frictional characterstics and give them the ability to be used in limited slip differentials.
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