Genuine Ford Fluid XO-15W40-QSD SAE 15W-40 Super Duty Diesel Motor Oil - 1 Quart Bottle High-quality diesel engine oil formulated with premium hydro processed base oils and unique additive technology It satisfies the warranty requirements of Ford Motor Company as well as most other domestic and import diesel engine manufacturers It meets the requirements of international, Cummins CES 20081, Volvo VDS-4, Mack EO-O premium plus, Detroit diesel 93K218 and Caterpillar ECF-3 Can be used in older engines where the manufacturer recommended API categories CD, CF-4, CG-4, CH-4, CI-4 and CI-4 plus Motorcraft SAE 15W-40 super duty diesel motor oil is suitable for power shift applications requiring Allison C-4 fluid