Red line 75W90NS is a GL-5 fully synthetic gear oil recommended for use in manual transmissions, transaxles and differentials, particularly those used in competition. It is suitable for use with clutch plate type LSD's to provide maximum lock up but not recommended for road car use as the oil does not have friction modifiers which prevents clutch plate noise. Red Line friction modifier can be added to this oil if quieter operation is required.Ideal for Motorsport useDoes not contain friction modifiers providing maximum lock up for plate type LSD'sProvides easier gear shifting across a wide temperature rangeProvides the highest level of component protection under extreme conditions for improved performance and lifeLowers operating temperatures by reducing the sliding friction in hypoid gears75W90NS offers excellent gear and synchro protection under harsh conditions and has balanced slipperiness for easier shifting in cold climates. Limited slip friction additives are available separatel