The Cummins 4BT is distinguished by its durability. This engine, which has a gear-driven timing system, forged internal parts, and a cast-iron block and head, is built to run continuously in challenging circumstances. With few internal repairs, several machines have more over 300,000 miles on them.

The Cummins 4BT is simple to maintain and repair because to its industrial origins. Its simple design enables mechanics and do-it-yourself builders to maintain it for decades, and replacement parts are easily accessible. It is an affordable option for work and performance enhancements because of its extended lifespan.