owner-operator Joe White bought this piece of trucking history, a 1960 Kenworth cabover, when he was 19 years old in 1970. He worked the truck for 30 years in total before retiring it. (skip the first 20 seconds)

The truck is on its fourth engine -- this one is a 1987-model 400 Cummins that White added in 1992.

 Joe White himself has had three different engines in it during the time he's owned it. "I get a little over a million miles, then I just get another motor," he said. It also has a two-stick 5 and 4 transmission. "I couldn't tell you how many transmissions I've had in it over the years," he noted. In all the years that I worked it, I pulled a flatbed. I hauled on the West Coast, lot of lumber, steel, pipe. Just about anything you can get on a flatbed, I would haul.

 I get a little over a million miles, then I just get another motor. Still got the five and the four transmissions. And the transmissions, I couldn't tell you how many transmissions I've had in it over the years. Still got the SQHD rear ends in it. All that stuff has been replaced many times, but none of it's been changed.

 I've done all my own maintenance. I overhaul the engines, the transmissions, rear ends, I done it all. You got to do a lot of maintenance if you want to keep them on the road for 40 years.

 I put three million on this. And I had another truck before this I probably put 150,000 on. I was only 18 years old when I bought that one. And then I went to work for another company, and I worked for them for a little over 20 years. And I put two and a half million miles on their trucks. So when I retired, I got over five and a half million miles.

https://www.overdriveonline.com/custom-rigs/video/15304434/1960-kenworth-cabover-still-rolling-after-millions-of-miles