What Oil is recommended for a Ford Excursion 7.3 diesel?

For a Ford Excursion with a 7.3L diesel engine, it's recommended to use a high-quality diesel engine oil that meets the API CI-4 or CJ-4 specifications. A common choice is 15W-40 weight oil, which provides good protection in various operating conditions. It's also advisable to choose oil from reputable brands that offer additives for enhanced performance and engine longevity. Always consult the owner’s manual for specific recommendations.