A semi synthetic Limited Slip Differential oil especially suitable for Historic Motorsport applications where an SAE 90 grade oil was originally specified. Can also be used in non-synchro (dog gearbox) and sequential gearboxes. Please note, it is not suitable for synchromesh or overdrive boxes. The formulation is based on a blend of high quality solvent refined and synthetic base oils, together with special additives and inhibitors, which are adapted to ensure proper operation of the transmission.