Lucas Gear Oil Transmission and Differential 75W-140 Synthetic 946ml 10121Lucas Pure Synthetic Gear Oils are super slick, long lasting lubricants designed especially for heavy duty or high performance applications where regular gear lubricants just aren't good enough. They contain a special additive package that increases lubricity and insures less gear noise and longer bearing life. Designed to stand up to high temperatures without losing its lubricity. Excellent for use in limited slip differentials.