Bel-Ray® ATV Trail Mineral 4T Engine Oil with Rust Defense System is a premium multi-grade 4-stroke ATV oil for the unique demands of all 4-stroke ATVs, Quads, and UTVs. Equally suitable for air-cooled/liquid-cooled 4-stroke engines. The specially developed Rust Defense System coats internal engine components providing unsurpassed rust and corrosion protection. Unbeatable anti-wear chemistry eliminates wear, extending engine life.