Trucks with a 6.7L Cummins engine have a block heater built in, so if you live in an extremely cold climate, you'll want to know where it's located.
Both Cummins and Ford offer 6.7-liter diesel engines. They share a few similarities, but those don't go much further than their displacements.
Cummins builds diesel engines well beyond 70 liters, so anything below the Class 5 truck market is “light duty” to them. However, the current High Output and standard 6.7-liter ISB inline-six oil ...