Bel-Ray Gear Saver Thumper Transmission Oil Liter 99510-B1LW Eliminates wear by chemically bonding to gear wear areas. Prevents metal-to-metal contact caused by heavy shock loads during on/off throttle operation Special lubricity additives cling to metal surfaces reducing internal friction. High film strength and reduced film thickness lower internal drag and heat build-up Prevents viscosity loss due to shear