Mobil Delvac 1300 super 10W-30 and 15W-40 are synthetic blend diesel engine oils that help extend engine life, allowing you to run your business with confidence. These oils meet or exceed original equipment manufacturer (OEM) requirements and deliver high performance in both on and off highway applications. Fully backward compatible, Mobil Delvac 1300 super engine oils deliver exceptional performance in both newer and older heavy duty engines. Developed in close collaboration with OEMs, Mobil Delvac 1300 Super engine oils are recommended for use in a wide range of heavy duty applications and operating environments in the trucking, mining, construction, agricultural and marine industries. Mobil Delvac 1300 Super engine oils are universal, meaning they may also be used in gasoline engines requiring the API SN specification.