The 2019+ Cummins engine marks a major shift with the introduction of roller lifters, replacing the long-trusted flat tappets. While this change promises reduced friction, it also introduces new concerns—premature bearing failure, increased maintenance demands, and potential catastrophic engine damage. Diesel enthusiasts and truck owners should take proactive steps to protect their investment, from stricter oil change intervals to aftermarket upgrades. Understanding these new challenges is key to keeping your Cummins running strong for years to come.

A failing turbo on your 6.7L Cummins can lead to excessive smoke, power loss, unusual noises, and oil leaks. Common culprits include worn bearings, actuator failure, and excessive backpressure. To diagnose, check for shaft play, monitor boost pressure, and inspect for leaks. Minor issues like stuck vanes or actuator problems may be repairable, but severe damage requires a full replacement. Whether opting for an OEM turbo or a performance upgrade, supporting mods like upgraded intercooler piping and high-flow exhaust can improve longevity. Catching turbo issues early can save you from costly repairs and keep your truck running strong.

If your 6.7L Cummins is experiencing hard starts, rough idle, excessive smoke, or a sudden drop in fuel economy, bad injectors could be the culprit. Faulty injectors can cause poor performance, fuel dilution, and even catastrophic engine damage if left unchecked. This guide breaks down nine key signs of injector failure, explains why they fail, and offers solutions for repair or replacement. Stay ahead of costly repairs by learning how to diagnose and maintain your fuel system properly.