Junkyard Gem: 1981 Mercedes-Benz 300SD with nearly 600k miles

I’m always on the lookout for cars and trucks with ridiculously high final odometer readings when I’m scouring the car graveyards for interesting bits of automotive history. Making this task difficult is the five-digit odometers used by just about all manufacturers prior to the 1980s and the electronic-display odometers you’ll find in most 21st-century machines, but I know where to look if I want to see more than 400,000 miles on the clock: Mercedes-Benzes.