What is high mileage for a 6.6 duramax diesel?

High mileage for a 6.6 Duramax diesel engine can vary depending on how well it has been maintained, driving conditions, and other factors. However, many owners report reaching over 200,000 miles with regular maintenance. Some owners have even reported reaching 300,000 miles or more before needing major repairs or replacements.

Regular maintenance, such as oil changes, fuel filter changes, and keeping up with recommended service intervals, can help prolong the life of the engine and prevent more expensive repairs down the line. It's also important to drive the vehicle responsibly, not towing heavy loads excessively or putting undue stress on the engine.

Overall, the 6.6 Duramax diesel engine is known for its reliability and longevity, and with proper care and maintenance, it can reach high mileage levels without significant issues.