Stens 4-cycle engine oil is specially formulated with zinc boosters to protect small engine components with optimal lubrication to reduce friction. This premium grade engine oil will help prolong engine life by reducing wear and lowering operating temperatures. Like all 4-cycle oils, this formula is meant for equipment in which the fuel and oil have separate holding tanks. This shear stable formula resists breaking down under heavy use. Stens 4-cycle engine oil meets API SJ ratings. Its low-deposit formula results in cleaner engines for better performance and longer service life. While reducing wear, it also prevents rust and corrosion of internal engine parts. This oil performs well at all temperature ranges, including cold temperatures for easier starting of small engines.