Mobil Delvac 1 5W-40 is a fully synthetic supreme performance heavy duty diesel engine oil that helps extend engine life while providing long drain capability and fuel economy for modern diesel engines operating in severe applications. Mobil Delvac 1 utilizes state-of-the-art technology to deliver exceptional performance in modern low emission engines, including refrigerated units, as well as older, well-maintained engines. Mobil Delvac 1 5W-40 is recommended for use in a wide range of heavy-duty applications and operating environments found in the on-road transport and off-road mining, construction, and agricultural industries. Mobil Delvac 1 also meets the API SL specification for gasoline engines used in mixed fleets. On-highway engines operating in both high speed/high load and stop-and-go conditions; Off-highway engines operating in severe low speed/heavy load conditions; Virtually all diesel powered equipment from American, European, and Japanese equipment builders; High performance gasoline engines and mixed fleets; Refrigeration units |