Cummins B-Series diesel engine boasts over 40 years of reliability

The Cummins B-Series diesel engine, first introduced in 1984, has earned a reputation for exceptional reliability over its 40-plus year history. This inline six-cylinder engine, initially for farm tractors, became a staple in Dodge Ram trucks from 1989. It has evolved into the modern 6.7L Cummins Turbo Diesel still found in heavy-duty Ram pickups. While generally praised for durability, some earlier 5.9L models had issues like the killer dowel pin and 53 block. Later 6.7L versions faced problems with hydraulic lifters and fuel pumps, though many have been addressed through recalls or simple fixes.