Just recently my '96 GMC Sierria reached 200k miles. So many people told me that it wouldn't make it that far and it did. My question for you is how long do these motors run for?
It will run for as long as you maintain it. We get work trucks in our shop with 300k+. Usually just oil leaks and water pumps on the motor or oil cooler hoses. Some lifter issues, but that is mosty a bad maintenance thing. Don't overheat it and it will last longer than you might want it to. Be worried about a transmission job before the motor.
