Motorcraft 5W-40 Full Synthetic Diesel motor oil XO5w405Q3SD for some Ford diesel applications. It is sold by the five (5) quart, 1.25 gallon jug on this listing. Recommended for use in Ford Power Stroke diesel engines over a wide ambient temperature range of -20° F to over 100° F. Check your owner's manual stating use of this fluid. The part number is XO-5w40-5Q3SD (replaced the XO-5w40-5QSD) and it is SAE grade 5w40, API Service CK-4 with Ford specification WSS-M2C171-F1.
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