Motorcraft?? SAE 15W-40 Super Duty Diesel Motor Oil is a high-quality light and heavy-duty diesel engine oil recommended by Ford Motor Company. It is particularly recommended for use in Ford vehicles equipped with Power Stroke?? Diesel engines, as well as in other diesel engine applications where the manufacturer recommends an oil of this viscosity grade and quality. It meets Ford WSS-M2C171-F1, required for use in Power Stroke?? Diesel engines designed to meet 2017 on-highway exhaust emission standards and requiring ultralow sulfur diesel fuel as well as meeting the requirements for previous model year diesel engines.