top of page

Cummins 6BT 5.9L 12v Engine (Design, Problems & Reliability)

Updated: Feb 2

✔ This article has been fact checked.

The Cummins 6BT is a 5.9L 12-valve inline six-cylinder turbocharged diesel engine, it produces 160-230 hp and 544-589 nm of torque. It's the most well-known Cummins B series truck engine

  • 1984 is when this engine began to be used in agricultural applications.

  • After 1989 it was used light-medium duty vehicles, and in some heavy duty trucks and buses.

  • The 6BT is also popular for engine swapping some vehicles.

  • Between 1989 and 1998 this engine became popular in Dodge Ram pickup trucks due to its power at low rpm and across the rev range, as well as better fuel efficiency than petrol V8s.

The 5.9L Cummins, also known as the 12-Valve Cummins, was the first member of the Cummins B-Series to be used in a light truck vehicle. It was the first diesel engine to replace V8 gasoline engines in full-size pickup trucks.

Table of Contents:

Cummins 6BT 5.9L 12v Engine

Cummins 6BT Eng