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?
Depends on how you've treated it. My '94 gasoline Sierra with 234K has mostly sat since I got the DMax in '04. Still runs fine very well and has never ever failed to start, even after being idle over the entire winter. Your truck will keep going until it stops.
