The Longevity of Diesel Engines

Reader Contribution by Todd Kaho
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I’m thinking about buying a diesel truck and I’ve heard stories about how long the engines last. Can they really go several hundred thousand miles?

While no engine will last forever, diesel engines have a distinct advantage in longevity over their gasoline counterparts. Mechanical parts wear out over time due to the friction caused by parts rubbing together. Diesel engines, however, are engineered and built to be more robust due to the higher compression ratio in the combustion chamber and the high torque output they produce. Diesel engines also operate at lower speeds (rpm) than gasoline engines, which means the bearings, piston rings, cylinder walls, valve train, etc., don’t rub together as often. Engine speeds are often half that of a gasoline engine.

These durable diesels are more expensive to purchase than a gasoline vehicle. But much of that investment can be returned when you trade or sell the diesel because they hold their resale value much better than gasoline cars and trucks. The transition to a diesel is easy?–?the only real difference is you pump diesel fuel rather than gasoline.

With proper lubrication and routine, basic maintenance, a diesel engine can last far more miles than a gas engine. Consider the example of retired Ford employee Gary Mueller (see photo). After his career at Ford, Mueller wanted to see the country and found a way to do so via taking a job delivering recreational vehicles by towing them on large, heavy trailers.

In 2002, Mueller purchased a Ford F-350 Super Duty pickup powered by a 7.3-liter Power Stroke diesel engine. The miles added up quickly. People started suggesting he trade the diesel pickup for a new one when it hit 300,000 miles. In 2011, the truck topped 1 million miles, and the original diesel engine is still running strong.

?Todd Kaho, Editor and Publisher,

Photo by Todd Kaho