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Full synthetic 5W-40 motor oil is formulated to flow like 5 Weight oil from a cold start in winter temperatures and like 40 Weight oil once the engine has reached its normal operating temperature. Motorcraft SAE 5W-40 Full Synthetic Diesel Motor Oil is a high-performance 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 engines as in truck bus construction and other heavy-duty diesel engine applications. It meets API service category CJ-4 required for use in diesel engines designed to meet 2007 on-highway exhaust emission standards and requiring ultralow sulfur diesel fuel. Do not use in gasoline engines equipped with catalysts.