Red Line Shock Proof Gear Oil - Heavy has a film thickness greater than an SAE 75W250, yet low fluid friction like 75W90. For use on heavily-loaded racing differentials and transmissions, and 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.

Red Line Shock Proof Gear Oil is a unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent. It offers a "best of both worlds" balance of low drag and superior protection for gear teeth. It has a relatively low viscosity, yet cushions gear teeth under extreme pressure. They help to prevent tooth breakage, resists throw-off. Avoid use with pumps, coolers, and filters as unique medium and affinity for metal can cause clogging.