Made using highly refined petroleum oils designed specifically for snowmobile engines. It utilizes a unique blend of specific additives and polymer systems that resist high shock loads high temperatures shearing and eliminates deposits. S-4M formula also includes our proprietary MPZ® additive that provides the highest degree of anti-wear and anti-friction for superior component life and engine performance. Recommended for use in air cooled or liquid cooled snowmobile 4-cycle engines commonly found in Arctic Cat® Polaris® Ski-Doo® Yamaha® and other snowmobile applications.