Phillips 66® Triton® Synthetic Transoil 50 is a premium-quality, full-synthetic manual transmission lubricant specifically engineered for high-torque, heavy-duty commercial vehicle transmissions. Formulated with a 100% synthetic base stock and a robust, non-EP (Extreme Pressure) additive package, it provides exceptional thermal stability and shear resistance for extended drain intervals. Unlike standard gear oils that can be corrosive to yellow metals, Transoil 50 is chemically balanced to be completely safe for the copper and brass synchronizers found in modern manual and automated manual transmissions (AMT). This fluid ensures effortless shifting in sub-zero coastal winters while maintaining an unbreakable lubricating film under the intense heat of mountain-grade hauling.