Duramax oil change interval
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Check oil level daily. Oil Drain Interval Fleetguard Filter 20,000 miles / 12 months LF 9009 (all ISL models) Replace oil filter at EVERY oil drain interval. Lubricating Oil Recommendations The primary Cummins recommendation is to use SAE 15W40 oil for normal operation at ambient temperatures above 5°F (-15°C).
Depending on vehicle age, type of oil and driving conditions, oil change intervals will vary. It used to be normal to change the oil every 3,000 miles, but with modern lubricants most engines today have recommended oil change intervals of 5,000 to 7,500 miles.