Because of its remarkable torque output, mechanical simplicity, and longevity, the 4BT Cummins engine is highly regarded. This 3.9L four-cylinder diesel engine, which was initially intended for commercial and industrial use, soon gained a reputation for requiring little maintenance over hundreds of thousands of miles. Both fleet operators and diesel fans love it because of its small size and gear-driven parts.

The 4bt Cummins' versatility is what really makes it stand out. This engine consistently performs well in harsh environments, whether it is used in bread trucks, generators, off-road vehicles, or bespoke swaps. It is still one of the most dependable diesel engines ever made, with mechanical fuel injection and no electronics in the majority of models.