Hey there, truck enthusiasts! If you’re into diesel engines like me, you’ve probably heard more than a whisper about the 3rd generation Cummins. Let’s dive into what makes these beasts so special, based on their specs and my own experiences.
Engine Overview |
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Years: 2010-2018 Design: Inline 6 Cylinder Displacement: 6.7 Liters (408 cu in)
Block: Cast Iron Cylinder Head: Cast Iron Bore: 4.21″ (106.9 mm) Stroke: 4.88″ (124 mm) Compression Ratio: 17.3:1 Firing Order: 1-5-3-6-2-4 |
Performance |
Horsepower: 350-385 at 2800-3,013 rpm Torque: 610-930 lb/ft at 1,500-1700 rpm Governed Speed: 3,013 rpm (2007-2012), 3,000 rpm (2013+)
Turbocharger: Holset HE351VE Variable Geometry Turbocharger (VGT) |
Fuel & Fluids |
Fuel: B5 Compatible (2007.5-2013), B20 Compatible (2013+) Fuel Tank Size: 28 or 32 Gallons DEF Tank Size: 5.5 Gallons
Engine Oil Capacity: 12 Quarts (11.4 Liters) Coolant Capacity: 5.7 Gallons (23.8 Quarts) |
Transmission |
Manual: G56 6-Speed Automatic: 68RFE 6-Speed, Aisin 6-Speed (2013+) |
Additional Specs |
Weight: 1150 lbs Dry Fuel Injection: Bosch CP3 High Pressure Common Rail System (29,000 PSI) Valvetrain: OHV with 4 Valves Per Cylinder Pistons: Cast Aluminum |
Table of Contents
What is good about the 3rd generation cummins?

Engine Performance and Refinement
The 3rd gen Cummins engines, spanning from 2003 to 2009, brought a significant leap in performance with the introduction of the common rail injection system. This wasn’t just a tweak; it was a game changer for fuel efficiency and emissions. I remember the first time I drove one of these; the power delivery was smooth, and the engine felt like it had an endless well of torque. The 5.9L 24-valve variant could push out around 325 horsepower and 600 lb-ft of torque, which was a notable jump from previous generations.
Reliability and Durability
One of the things I love most about these engines is their reliability. I’ve seen trucks with well over 300,000 miles on the odometer still running strong. Regular maintenance, of course, but these engines seem to be built for the long haul. The 5.9L’s reputation for durability is legendary among truck owners, and it’s no wonder they’re still in demand in the used market.
Technology Upgrades
The trucks housing these engines also saw significant upgrades in comfort. I recall driving my first 3rd gen with the Mega Cab – the space was incredible, a real luxury for long hauls. Plus, the integration of more modern tech in the cabin made the driving experience much more enjoyable, from better audio systems to more intuitive dashboard controls.
Aftermarket Modding Potential
If you’re like me and love tweaking your ride, the 3rd gen Cummins is almost like a playground. There’s a massive aftermarket support system for these engines. Whether you’re looking to boost performance, enhance fuel economy, or just customize for style, there’s a part or mod for nearly everything.
Towing Capability
I use my truck for towing, and the 3rd gen Cummins doesn’t disappoint. The torque curve is just right for pulling heavy loads without overworking the engine. Towing capacities were impressive, with many models capable of pulling well over 20,000 pounds when properly equipped.
Comparison Table: Cummins Generations
Feature | 1st Gen (1989-1993) | 2nd Gen (1994-2002) | 3rd Gen (2003-2009) | 4th Gen (2010-2012) |
---|---|---|---|---|
Engine Size | 5.9L | 5.9L | 5.9L/6.7L | 6.7L |
Fuel Injection | Mechanical | Mechanical | Common Rail | Common Rail |
Max Horsepower | ~160 HP | ~245 HP | ~325 HP | ~350 HP |
Max Torque | ~400 lb-ft | ~505 lb-ft | ~600 lb-ft | ~650 lb-ft |
Emission Compliance | None | Basic | Improved | Enhanced |
Durability | Good | Very Good | Excellent | Excellent |
Towing Capability | Moderate | High | Very High | Very High |
Aftermarket Support | Limited | Good | Extensive | Extensive |
Cabin Comfort | Basic | Improved | Significantly Improved | Modernized |
Wrapping Up
The 3rd generation Cummins engines stand out not just for their specs but for the overall package they offer. From performance to durability, comfort to modding potential, they’ve set a benchmark that’s hard to beat. Whether you’re in the market for a new workhorse or simply appreciate the evolution of diesel tech, these engines are a testament to what makes diesel engines so beloved in the truck community. If you’re considering one, my advice? Don’t sleep on the 3rd gen. They’re not just good; they’re exceptional.