Motive Gear 75W-140 Synthetic Gear Lube
Motive Gear limited slip synthetic gear oil is designed specifically for use in differentials. It features a 75W-140 GL-6 formulation made for extreme usage. While protecting your ring and pinion gear, it will lower differential temperatures significantly, giving you better performance and longer life.
75W-140 full synthetic with friction modifier for limited-slip differentials, but works with all differentials. Sold by the quart.