Klotz SnowX4 Synthetic Lubricant is designed for use in the new generation of 4-stroke performance snowmobile engines. SnowX4 exceeds warranty requirements of all leading manufacturers, including Ski Doo, Arctic Cat, Polaris, and Yamaha that require API certification. Estorlin technology is an advanced synthetic lubricity system which contains precision engineered lubricating molecules that protect engine components from molecular shearing and extreme heat. SnowX4 is specially formulated for cold start flow, thermal stability, and reduced friction, providing Less Drag...More Power.