AMSOIL Formula 4-Stroke Small Engine Oil (ASE) is a robust formulation designed for high-temperature, severe-service operation of small engines where routine maintenance is often difficult or infrequent. It is formulated with premium synthetic base oils that exceed both 10W-30 multi-grade and SAE straight-grade viscosity requirements. AMSOIL ASE has a naturally high viscosity index and does not contain paraffin (wax). Its -38°F pour point and superior high-temperature performance makes AMSOIL Formula 4-Stroke Small Engine Oil a premium all-season lubricant, perfect for the small generators found on most RVs.