Red Line Lightweight Shockproof fully synthetic gear oil. Film thickness greater than an SAE 75W140, yet low fluid friction like 80W gear oil or 30W motor oil. Excellent low-temp flow, improved cold shifting. For racing differentials under moderate loads. Popular in racing transmissions like Hewland and other Road Racing dog-ring boxes, Bert and Brinn for Stock Cars, G-Force and Liberty clutchless for Drag Racing. 1 quart / 0.946 liter bottle.