There's no way to predict when the truck will stop working. However, that milage isn't a problem as long as it is in good shape and is well maintanined. I've seen many of these trucks with well over 200K, and some with well over 300k on them. My old Chevy has a little over 400K right now and I'll drive it anywhere i need to go. So its' just a matter of keeping it properly maintained (oil changed regularly, cooling system flushed, etc.)