Sierra TC W3 oil is a high performance lubricant that has been manufactured and designed to meet and exceed all (Domestic & Import) engine manufacturers warranties. The TC-W3 formula provides superior lubrication and detergency at maximum operating temperatures and stress loads. It has been formulated to improve performance and extend engine life by reducing wear on critical engine components. Additionally, Sierra's TC W3 oil reduces ring sticking, deposit formation and exhaust port blockage, resulting in less friction to allow for easier starting.