Grün Fluids SAE 50 Full Heavy-Duty Manual Transmission API MT-1 fluid is formulated from a combination of premium synthetic base oils and advanced high-performance additive package that provide maximum long-life, all temperature, year-round equipment protection for heavy duty transmissions that require a premium non E.P. fluid. Grün Fluids full synthetic Transmission fluid reduces friction and wear at start-up and maintains lubricity and film strength at high temperatures.  It meets the requirements of Eaton and Rockwell for Extended Drain Intervals ad can lower maintenance and downtime costs.