Mobil Delvac Super 1300 15W-40 is a high performance diesel engine oil that provides proven engine protection of diesel engines operating in on and off-highway severe service applications. Mobil Delvac Super 1300 15W-40 is recommended by ExxonMobil for use in a wide range of heavy-duty applications and operating environments found in the trucking, mining, construction, quarrying, and agricultural industries.