Sophisticated reproductions of original parts have made it incredibly hard for even the trained eye to distinguish real from fake, Cummins said. “These illegal imitations of engine components, oils ...

The 6.7L Cummins engine is known for its reliability and performance in heavy-duty trucks like the RAM 2500 and 3500 models. Yet even a diesel engine as impressive as this has room for improvement.

The amount of horsepower and torque delivered by a stock 6.7L Cummins diesel engine depends on when it was released. The earliest versions of the 6.7 Cummins diesel, introduced around the middle ...