Compatibility: Designed for use with gear oils of viscosity 75W, 80W, SAE 40, as well as 10W40 and 15W40 motor oils. MT-90 75W-90 GL-4 Synthetic Lubricant - 1 Gallon. Your manual transmission deserves only the best; trust MT-90 75W-90 GL-4 Synthetic Lubricant for unmatched performance and reliability.