Loading

What year of 6.7 Cummins to avoid?

When it comes to the 6.7 Cummins engine, certain model years are better avoided due to known issues and problems. By understanding the history and evolution of this popular diesel engine, you can make an informed decision on which year to choose for your vehicle.


The 6.7 Cummins Engine: A Brief Overview


The 6.7 Cummins engine is a powerful and reliable diesel engine found in various Dodge/Ram and Ford trucks. Introduced in 2007, the 6.7 Cummins has undergone several updates and improvements over the years to address common issues and enhance performance. However, not all model years are created equal, and some are better avoided than others.


Problematic Years to Avoid


Based on extensive research and user feedback, the following model years of the 6.7 Cummins engine are generally considered the most problematic and should be avoided:



  • 2007-2009: These early model years of the 6.7 Cummins engine were plagued by various issues, including turbocharger failures, fuel system problems, and excessive oil consumption.

  • 2010-2012: While improvements were made, these model years still experienced some lingering issues, such as injector failures and problems with the diesel particulate filter (DPF) system.


It's important to note that individual experiences may vary, and proper maintenance and care can help mitigate some of these problems. However, if you're in the market for a used 6.7 Cummins-powered vehicle, it's generally recommended to avoid these problematic model years and instead focus on later, more refined versions of the engine.


Recommended Model Years


The 6.7 Cummins engine has continued to evolve, and later model years have addressed many of the earlier issues. The following model years are generally considered the most reliable and recommended choices:



  • 2013-2018: These model years have seen significant improvements in reliability, with fewer reported issues related to the turbocharger, fuel system, and DPF system.

  • 2019-present: The latest iterations of the 6.7 Cummins engine have further refined the design and addressed any remaining concerns, making them the most reliable and desirable options.


By focusing on the later model years of the 6.7 Cummins engine, you can enjoy the power and durability of this renowned diesel powerplant while minimizing the risk of encountering costly and frustrating problems.

What years to stay away from Dodge Cummins?


Therefore, you should avoid the worst model years of Dodge Cummins to get a pleasant driving experience. Due to higher problem counts and lower reliability and safety ratings, the Dodge Cummins model years from 1991 to 1993, 1999, 2003, 2006, 2007, 2008, and 2010-2013 should be avoided.



What is the holy grail of diesel trucks?


The grail of the grail seems to be the 1998 Ram 2500 Quad Cab with a 12-valve Cummins and a manual transmission. Why? 1998 was the first year for the Quad Cab (four-door), but the last months for the 12-valve. Ram owners can tell you that the automatics in these trucks weren't a strong point.



What year should I not buy a Dodge Ram 2500?


General Buying Advice: Avoid The 2013-2018 Model Years
As such, if you're in the market for the most reliable RAM 2500 year, skip the 2013 to 2018 models because they're riddled with reliability woes, recalls, and complaints. For example, the 2013 model year doesn't quite hit the landing in reliability.



What Cummins block to avoid?


But not all the manufacturer's diesel engines have been so beloved. In fact, roughly a decade after Cummins began outfitting trucks bearing the Ram badge with engines, it delivered one of the worst diesels in its history, the so-called "53 Block."



What year of Cummins are most reliable?


Fans Say These Are The 5 Best Years For Cummins Diesel Engines

  • By John Davis May 21, 2024 11:15 am EST.
  • First-generation 5.9-liter 12-valve (1989 - 1993)
  • Second-generation 5.9-liter 12-valve (1994 - 1998)
  • Late second-generation and third-generation 5.9-liter 24-valve (2002 - 2007)



What years are the best to avoid the 6.7 Cummins?


Anything 2012 or newer. Avoid 2011, they had glow plugs problems. 2015+ for a better turbo and more power. Really, the newer the better, but anything from 2012 on is going to be pretty solid.



What is the most desirable Cummins engine?


High Output 6.7L Cummins I-6
One of the best truck engines to handle heavy hauls is the 6.7L Cummins, which offers the most torque ever available in a non-commercial vehicle: Power — 310 hp @ 3,200 rpm.



Why is the 12 valve Cummins so sought after?


A stroke of 4.72 inches (accompanied by a 4.02-inch bore) yields 359 cubic inches, incredible low-rpm torque and remarkable fuel efficiency. Along with it being in an inline engine's nature to produce gobs of torque, they're also easier to work on than the V8 competition.



What is high mileage for a 6.7 Cummins?


If your Cummins-powered RAM, TITAN XD pickup, Cummins Repowered crate engine vehicle, RV or other Cummins powered vehicle has surpassed the 100,000-mile mark, we'd be honored to have you in the Cummins High Mileage Club.



What year did Cummins have a bad block?


The second potentially deadly flaw occurs in '99 to '02 5.9L Cummins 24-valve engines. It's known as the 53 block problem, because these engine blocks have the number 53 cast into the side of the crankcase. After years of use, the 53 blocks tend to crack until coolant starts to pour out the side of the block.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.