Half a million miles without a rebuild sounds like the stuff of automotive legend — yet for owners of the Mercedes-Benz OM606 diesel, it’s a well-documented reality. In an era when most engines are considered long-lived if they crack 200,000 miles with minimal fuss, this 1990s inline-six has quietly built a cult following among enthusiasts who prize longevity above all else. Whether you’re a diesel devotee or simply someone who wants a car that refuses to quit, the OM606’s story is worth knowing.
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