Super S SuperSyn™ Trans-Fluid 50 is a full synthetic, heavy duty SAE 50 manual transmission fluid formulated with premium quality synthetic base stocks and high performance additives for API MT-1 non-EP and Eaton PS-164Rev7 extended drain service. Designed to provide maximum protection and extended operating life to heavy duty transmissions, SuperSyn™ Trans-Fluid 50 provides significant advantages over conventional sulfur-phosphorus gear oils, including outstanding high-temperature performance, oxidation stability, wear protection, and corrosion control. The outstanding performance of this product is confirmed by its suitability for heavy-duty transmissions covered by Eaton Roadranger and Extended Warranties of 750,000 miles, with oil drains of 500,000 miles. It is also suitable for Mack against its TO-A Plus 500,000 mile extended service classification. SuperSyn™ Trans-Fluid 50 meets or exceeds the requirements of the API service MT-1 EP gear oil service classification and is recommenced by Smitty's Supply for use in transmissions and gear cases where API Service GL-1 through GL-4 gear protection is required.