There are engines with reputations for being able to rack up over 500,000 miles with steady maintenance. Among those, Mercedes-Benz and its diesel engines are legendary. Here, we look at one of ...

You'll see examples of the W123 still driving every day, all over the world, and the most legendary type is the OM617-equipped turbocharged diesel sedan. Here's a final-year-of-production '85 that ...