How often shouldn you change oil in a duramax 6.6?

For a Duramax 6.6 diesel engine, it's generally recommended to change the oil every 7,500 to 10,000 miles, depending on driving conditions and usage. If you frequently tow heavy loads or drive in extreme temperatures, you may want to change it more frequently, around every 5,000 miles. Always consult the owner's manual for specific recommendations based on your vehicle's year and model. Regular oil changes help maintain engine performance and longevity.