The MOBIL SHC 634 Synthetic Gear & Bearing Oil is a supreme performance oil that is designed to provide great service, well beyond the capability of mineral oils. The MOBIL SHC 634 oil provides: Equipment protection, Oil Life, and Problem-free operation enabling increased customer productivity. This scientifically engineered oil is formulated from base fluids with a high viscosity index. Also, the oil has a unique, proprietary, additive system which enables this MOBIL product to provide outstanding performance in all types of service applications, even at high and low temperatures.