* Maintenance: Regular and proper maintenance is crucial. Neglecting oil changes, fuel filter replacements, and other scheduled maintenance will significantly shorten the engine's life.
* Driving Habits: Aggressive driving, frequent towing of heavy loads, and idling for extended periods all put more stress on the engine and reduce its lifespan.
* Operating Conditions: Extreme temperatures (both hot and cold) can affect engine performance and longevity.
* Specific Engine Model and Year: Duramax engines have evolved over the years, with different models having varying strengths and weaknesses.
While some Duramax engines have been known to reach 500,000 miles or more with proper care, others may experience significant wear and tear much sooner. A more realistic expectation for a well-maintained Duramax, with moderate use, might be in the 300,000 - 400,000 mile range. However, this is just an estimate, and individual experiences will vary greatly.
It's important to remember that "average" in this context is misleading. Focusing on proper maintenance is far more important than chasing an arbitrary mileage number.
