characteristics allow the lubricant to resist throwoff and provide a film thickness greater than an SAE 250 grade, with the same low fluid friction as with Red Line's 80W140. Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes. Offers a "best of both worlds" balance of relatively low drag and the utmost in protection. - Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90 - For heavily-loaded racing differentials and transmissions, problem gearboxes - Many performance racing applications like Sprint/Midget/Dirt Late Model 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.