The 6.7L Cummins diesel engine has powered Ram Heavy Duty trucks since 2007.5, becoming one of the most popular engines in the diesel truck world.
Whether you’re shopping for a used Ram or planning upgrades to your current truck, it’s smart to know which years are considered the “best” — and why.
Below, our team at FASS Motorsports takes a balanced look at the different 6.7 Cummins generations, their strengths, known issues, and what truck owners typically say about them.
2007.5–2009: First 6.7 Cummins Generation
The 6.7L Cummins debuted mid-2007, replacing the 5.9L. It introduced higher torque ratings, a variable-geometry turbo (VGT), and emissions systems including the EGR and DPF. While the bottom end of these engines is strong, early years experienced:
- Frequent DPF regens and soot-related issues
- Turbo actuator failures due to soot build-up
- Less refined tuning from the factory, resulting in rougher driveability
Many owners appreciate these years for their **mechanical simplicity** compared to newer trucks, but emissions systems were in their infancy, making reliability a mixed bag.
2010–2012: Refinement Begins
These model years saw improved factory calibrations and some emissions updates. Dodge became Ram in 2010, and trucks benefitted from better integration of emissions controls and drivability refinements. Common upgrades for these years include:
- Upgraded fuel filtration systems for added injector protection
- Turbo and actuator service to address carbon build-up
- Performance tuning on pre-DEF trucks (2010–2012 models are still sought after by some enthusiasts)
2013–2018: A Favorite Among Many Enthusiasts
The **2013–2018 6.7 Cummins trucks** are widely regarded as some of the best-balanced model years. Here’s why:
- Improved emissions systems: DEF (Diesel Exhaust Fluid) was added, which actually reduced soot load on the EGR/DPF, improving reliability.
- Stronger factory calibration: Smoother power delivery and better towing manners.
- 6-Speed Manual: The much-loved G56 6-speed manual was available up through 2018, and discontinued in 2019. For manual transmission fans, the 2013-2018 Ram is the perfect choice.
- More robust fuel system: CP3 pump was used through 2018 in many trucks (before the switch to CP4 in 2019), known for better longevity.
- Good aftermarket support for lift pumps, tuners, and turbo upgrades.
Many consider these years the “sweet spot” for **reliability, tunability, and modern comfort**. Trucks from this era are still highly sought after in the used market.
2019–2020: Power Gains with CP4 Concerns
2019 introduced a major power bump (400+ HP and 1,000 lb-ft torque in some trims), along with updated interiors and Aisin transmission refinements. However, these years also switched from the CP3 to the **CP4 high-pressure fuel pump**, which has a known failure mode that can send metal shavings through the entire fuel system if it fails.
Popular upgrades for these trucks include:
- CP3 Conversions: Typically done under factory warranty/recall.
- Lift pumps to ensure proper fuel supply and filtration.
2021–Present: Most Advanced… and Most Locked Down
Modern trucks have the best ride quality, technology, towing capacity, and factory power — but they also come with the **most advanced ECM encryption**, limiting aftermarket tuning options. These trucks use the updated CP3 pump (reintroduced in 2021 after CP4 issues) and refined emission systems.
For owners who want a reliable daily and tow rig with minimal tinkering, these are excellent trucks. But if your goal is heavy performance tuning, these years require patience while the aftermarket develops solutions.
So… What Are the “Best” Years?
It depends on what you value most:
- Best balance of reliability and mod potential: 2013–2018
- Best for modern comfort: 2019+ (with fuel system upgrades)
- Most affordable entry point: 2007.5–2012 (with the understanding that emissions systems may need attention)
Popular Upgrades for Any 6.7 Cummins
- FASS Fuel Systems: Adds filtration, removes air/vapor, and extends injector pump life.
- Suspension upgrades: Leveling kits, traction bars, and shocks improve ride and towing.
- Lighting, wheels & tires: Top choices for personalization and utility.
How FASS Motorsports Can Help
At FASS Motorsports in Washington, Missouri, we stock and install the most trusted upgrades for all generations of the 6.7 Cummins. Whether you daily drive, tow heavy, or build for power, we’ll help you select the right components for your goals.
👉 Shop 6.7 Cummins parts online
👉 Visit our showroom in Franklin County, MO for expert advice & installation
Questions? We’re Here to Help.
- Phone: (636) 429-7020
- Email: info@fassmotorsports.com