Red Line's ShockProof Gear Oil features a unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. Acting like a liquid grease, the viscosity characteristics of ShockProof Gear Oil allow the lubricants to resist throw-off and provide the protection of a greater film thickness with relatively light fluid viscosity, offering a "best of both worlds" balance of low drag and superior protection. ShockProof Gear Oil products work in a variety of differential and transmissions, however, should not be used with pumps, filters, and with small lines--these fluids are designed wet sump or splash type lubrication. The Red Line Super LightWeight ShockProof Gear Oil is a unique product with the viscosity of 75W90 gear oil but lower internal friction similar to that of an ATF. Used when temperatures are not high and when the maximum power output is required such as in stock car qualifying laps. Used in low-power road racing transaxles like Formula Vee and low-power SCCA Production classes (dog-ring type, generally not sycro application where this product can be slippery).