Mobil Delvac 1300 Super Motor Oil 15W-40 For Diesels

Mobil Delvac 1300 Super 15W-40 is a synthetic blend diesel engine oil built for the demands of heavy-duty applications. Whether you are running a pickup with a diesel powertrain, farm equipment, or construction machinery, this oil meets the API CK-4 specification along with CJ-4, CI-4 PLUS, and CH-4 ratings.

The 15W-40 viscosity grade provides a good balance between cold-start flow and high-temperature film strength, making it suitable for year-round use in most climates. Mobil's formulation focuses on wear protection, oxidation stability, and TBN retention — the base number that indicates how well the oil neutralizes acids from combustion byproducts. For diesel engines, that acid-neutralizing capacity directly affects how long you can run between oil changes. Mobil states this oil can also be used in gasoline engines requiring the API SN specification, which makes it a versatile option for mixed fleets.

This 1-quart bottle works well for top-offs between changes or for smaller equipment that does not need a full gallon.