Pennzoil 40W Heavy-Duty Motor Oil, quart, exceeds the U.S. warranty requirements for all domestic and imported passenger car and light-duty truck engines calling for single-grade oils. Protects today's high-revving 4, 6, and 8 cylinder engines (even turbocharged), as well as older, high-horsepower engines. Also suitable for engines that have been converted to propane, butane, or LPG use. Can be used in hydraulic systems, air compressors, and industrial circulating systems where a motor oil is recommended (NOTE: Viscosity temperature guidelines must be observed). For gasoline, diesel, and turbocharged engines. API classification SG/CD.