Torco T-4R 4-Cycle Oil is a 100% synthetic base oil combined with Torco’s proprietary race proven additives. Designed specifically for high output, heavily stressed engines, T-4R reduces friction, temperature, oil consumption and helps to extend drain intervals. Anti-wear and anti-friction additives work to improve shear stability and provide smooth, positive clutch engagement and extreme pressure protection. T-4R is a non-friction modified formula, making it safe for both integrated and separate transmission systems