Which W124 engine is the most reliable?
These MERCEDES-BENZ W124 diesel engines are legendary for their indestructibility – mileages of over 500,000 kilometers without an engine overhaul are not uncommon. The OM606 in particular, with its indirect injection and robust design, developed into the most reliable engine of the entire series. Are Mercedes 300D engines reliable? Yes, particularly the OM617 engine. With regular oil changes and basic maintenance, these engines routinely surpass 300,000–500,000 miles. Reliability drops if neglected—especially regarding glow plugs, vacuum lines, and coolant system upkeep.While classic engines remain robust, newer rebuilds may include updated parts to enhance longevity and efficiency. How long can a Mercedes-Benz engine last? A well-maintained Mercedes-Benz engine can typically last between 250,000 to 300,000 miles.