Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90 For heavily-loaded racing differentials and transmissions, problem gearboxes Most popular ShockProof product, many racing and specialty applications Many performance racing applications like Sprint, Midget, Dirt Late Model and Quick Change Differentials, Detroit Lockers and spools, NHRA Top Fuel and Funny Car rear ends Not recommended for most synchro applications due to the product's extreme slipperiness