How often should oil be changed in a diesel engine?

Oil in a diesel engine should typically be changed every 5,000 to 7,500 miles, depending on the manufacturer's recommendations and the type of oil used. For vehicles operating under heavy loads or in extreme conditions, more frequent changes may be necessary. It's essential to consult the owner's manual for specific guidelines tailored to your engine and driving conditions. Regular oil changes help maintain engine performance and longevity.