Join Date: Dec 2007
Location: Michigan City, IN
This is a clip from a lengthy GM Document ID #2021833
The Duramax™ 6.6L V8 Turbo Diesel Engine is sold with a warranty of 100,000 miles/160,000 kilometers. The Duramax™ has been tested to survive upwards of 200,000 miles/320,000 kilometers. The Duramax™ powertrain is designed for reliability, peak horsepower and torque within its design limits. When a customer installs a power-up device, it drastically reduces the mileage ratings.
I'm quite sure a Duramax will last as long as the engine is maintened and not mistreated.