1983 Mercedes-Benz 300D

The W123 is the car that built Mercedes' reputation for indestructibility. Specifically, the 300D turbodiesel became the unofficial taxi of the third world, the eco-warrior's grease-car conversion platform, and the ultimate proof that German engineering could laugh at the odometer.

These cars routinely hit 300,000, 400,000, even 500,000 miles with original engines. The OM617 five-cylinder turbodiesel is considered one of the most reliable engines ever built.

While American cars were being strangled by early emissions equipment, the W123 diesel just kept clattering along, sipping fuel and refusing to die. The stacked headlights became an icon — a look that said 'serious car, serious engineering.'

The W123 wears patina with dignity. Faded paint, oxidized chrome, and interior wear just add to the taxi-cab-that-escaped-to-America aesthetic. These cars look right with some miles showing.

Over-restoration is almost counterproductive — the whole point of the W123 is that it's a working tool, not a show car. The ones that have been daily-driven for decades and still run are the purest expression of what Mercedes built.

The W123 is Mercedes ownership for people who actually wrench. Parts are plentiful and inexpensive. The mechanical simplicity is the opposite of modern cars — you can diagnose most problems with your ears and basic tools.

The turbodiesel is slow by modern standards, but the torque makes it relaxing to drive. Join the W123 community; these cars have some of the most dedicated owner forums anywhere.

Expect to learn about glow plugs, vacuum systems, and the meditative hum of a five-cylinder diesel at idle.