Some engines earned their reputations by surviving years of hard work, neglect, and high mileage. Their durable materials, conservative designs, and straightforward layouts made them easier to maintain and capable of handling demanding service. These seven engines are often remembered for their exceptional longevity.

Mercedes-Benz OM617

The Mercedes-Benz OM617 became legendary for its ability to survive extremely high mileage. Its inline-five-cylinder diesel used conservative engineering and relatively low operating stress. The engine powered several Mercedes-Benz passenger cars and utility applications, where long-distance reliability was important. With proper maintenance, many examples remained in service for decades.

Toyota 22R

The Toyota 22R became famous for its simple design and impressive durability. Its four-cylinder layout, conservative power output, and sturdy construction made it well suited to Toyota pickups and utility vehicles. Proper maintenance helped many examples accumulate substantial mileage. Mechanics often appreciate the engine because its straightforward architecture makes routine repairs and servicing relatively uncomplicated.

Toyota 1HZ

The Toyota 1HZ was developed with durability as a major priority. Its naturally aspirated 4.2-liter diesel uses a relatively simple mechanical design and conservative tuning, allowing it to handle demanding workloads without excessive complexity. Widely used in Land Cruiser models, the 1HZ became particularly respected in remote and harsh environments where dependable operation was essential.

Cummins 5.9

The Cummins 5.9 became one of the most respected diesel engines in the American pickup market. Its inline-six configuration, substantial internal components, and strong low-end torque made it well suited to towing and heavy workloads. Properly maintained examples can accumulate exceptionally high mileage, helping the 5.9 earn a reputation for long-term durability.

Ford 300 Inline-Six

The Ford 300 cubic-inch inline-six became renowned for its durability in pickups and commercial applications. Its simple overhead-valve architecture, strong torque, and conservative design allowed it to handle demanding workloads. The engine was not built for high performance, but its ability to continue running under hard use made it one of Ford’s most respected workhorse engines.

Toyota 2UZ-FE

The Toyota 2UZ-FE was engineered specifically for trucks and SUVs, where durability and low-end torque were important. Its cast-iron block and conservative tuning helped it withstand towing, hauling, and off-road use. Found in vehicles such as the Tundra, Sequoia, and Land Cruiser, the 4.7-liter V8 developed a strong reputation for dependable long-term service.

International DT466

The International DT466 was designed for demanding commercial applications rather than ordinary passenger-car use. Its inline-six configuration, robust construction, and wet-sleeve design allowed major components to be rebuilt and returned to service. Used in trucks, buses, and other equipment, the DT466 demonstrated how serviceability and durability could be engineered into an engine from the beginning.

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*Research for this article included AI assistance, with all final content reviewed by human editors