GL-5 Full Synthetic SAE 75W-140 Hi-Performance Gear Oil Qt VP Hi-Performance SAE 75w140 LS API GL5 Gear Oil is fully synthetic. It provides outstanding shear stability, low-temp fluidity, low frictional drag, and foaming resistance. Our limited slip gear oil affords excellent all-climate, year-round protection against high-speed scoring, low speed/high torque wear, and heavy shock loading conditions. VP's 75w140 synthetic gear oil meets the requirements of API GL-5/PG-2 limited-slip, MT-1, MIL-PRF-2105E, and Mack GO-J. For use in both light or heavy-duty axles and heavy-duty non-synchronized manual transmissions, as well as limited-slip differentials. We use synthetic base stocks with a high viscosity index. We add extreme pressure additives and rust and corrosion inhibitors.