Mobil Delvac Synthetic Gear Oil 75W-90 is a synthetic drivetrain lubricants engineered to meet the most demanding extended drain and warranty requirements. Mobil Delvac Synthetic Gear Oil 75W-90 is designed for use in heavy-duty drivetrains that require gear lubricants with relatively high viscosity and excellent load-carrying capability and where extreme pressures and shock loading are expected. Mobil Delvac Synthetic Gear Oil 75W-90 incorporates the latest technology in synthetic basestocks and advanced additives providing significant advantages over mineral gear oils.