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What is a 6.7 Cummins?

Author

John Castro

Published Mar 13, 2026

What is a 6.7 Cummins?

The Cummins 6.7L Turbo Diesel is the most powerful engine option for RAM 2500 and 3500 pickup trucks. Producing up to 400 horsepower and 1,000 pound-feet of clean diesel torque, this powerhouse helps RAM deliver best-in-class towing.

Besides, is the Cummins 6.7 a good engine?

The 6.7L Cummins started its run for 2007.5 model year Ram trucks with 350hp and 650 lb-ft of torque. Due to the aforementioned emissions control components, fuel economy is noticeably lower on 6.7L-equipped trucks as well as its overall reliability.

One may also ask, what Turbo does a 6.7 Cummins have? In 2007, Dodge trucks began using the 6.7L common rail Cummins diesel turbocharger engine, which uses a Variable Geometry Turbocharger (VGT). On the 6.7L, the VGT has a patented one-piece sliding nozzle that continuously moves to vary the power of the turbine and the amount of air delivered to the engine.

Also to know is, is 6.7 Cummins a v8?

Both the 6.6L Duramax and 6.7L Power Stroke are V8 engines, with the 6.7L Cummins being an inline six-cylinder diesel engine.

How many valves does a 6.7 Cummins have?

6.7L Cummins Diesel Specs

Production Years:2007.5 - current
Valvetrain:2019+OHV, 4 valves per cylinder, hydraulic lifters, cam-in-block
Reciprocating assembly:2007 - 2018Cast aluminum pistons, powdered metal connecting rods
2019+Cast aluminum pistons, forged alloy steel connecting rods
Weight:2007 - 2018~1,120 lbs dry

What are the problems with the 6.7 Cummins?

Cummins Turbodiesel Problems
  • 12v Cummins Killer Dowel Pin (KDP)
  • 24v Cummins #53 Engine Block Cracking.
  • 5.9L Cummins Fuel Pump, Injection Pump, & Injector Failures.
  • 5.9L Cummins Cracked Exhaust Manifolds.
  • 5.9L Cummins ISB Dead Accelerator Pedal.
  • 5.9L Cummins ECM Failure.
  • 6.7L Cummins Clogged DPF (Diesel Particulate Filter)

What problems does the 6.7 Cummins have?

In stock form, the main issues with the 6.7 models seem to be emission related. Specifically - the turbo, EGR cooler and DPF are prone to getting sooted up. When this happens, your truck will go into "limp mode" unless you get those parts cleaned.

What's the best year Dodge Cummins to buy?

1994-1998 2500 & 3500
This is the truck that put Dodge back on the map in 1994. The all-new Ram body style did most of it, but the 5.9L Cummins was there to make sure it delivered. As far as performance potential goes, it doesn't get any better than the mechanical P7100 equipped versions of the 12-valve 5.9L Cummins.

How much horsepower can you get out of a 6.7 Cummins?

The new high-output engine boasts 400 hp and 1000 lb-ft of best-in-class torque. For RAM 2500 and 3500 (equipped with a 68RFE Auto) HP and torque have increased to 370 hp and 850 lb-ft to provide the right power for these models.

Is 5.9 or 6.7 Cummins better?

Since the 5.9l is an older engine, you would expect it to be somewhat less efficient. However, due to the more stringent EPA emission rules, the 6.7l has additional filters and redactors. This makes it cleaner, sure, but the tradeoff is a noticeably lower fuel economy.

How many gallons does a 6.7 Cummins take?

6.7L Cummins Diesel Specs
Production Years:2007.5 - current
Oil Capacity:12 U.S. qts w/ filter
Fuel:ULSD; 2007 - 2013 models are B5 Biodiesel compatible, 2013.5+ models are B20 biodiesel compatible
Governed Speed:• 3,013 rpm (2007 - 2012) • 3,000 rpm (2013+)
Horsepower:350 - 400 hp, see chart below

What is high mileage for a Cummins?

800,000 miles

What is high mileage for a Cummins diesel?

100,000-mile

Why are Cummins engines so good?

A Cummins diesel engine is recognized around the world as a superior truck engine not only because a Cummins engine will have the horsepower and torque a work truck needs to tow a hefty load, but these engines are also noted for unmatched durability.

Why Cummins is better than Duramax?

About Duramax Engines
Their high horsepower and torque outputs directly compete with Cummins engines, as well as PowerStroke. In addition to durability, Duramax engines are known for their quiet performance. The Duramax LP5 in particular is 38% quieter than previous versions.

Is Cummins Diesel owned by Ford?

Cummins set the record straight in their May 2013 newsletter, outlining that Ford Motor Company had purchased 10.8% of the diesel engine manufacturer in 1990. In 1997, those shares were bought back, and as such Ford has not owned a stake in Cummins since.

What is the strongest Cummins Engine?

The new 4000 hp QSK95 is the highest horsepower diesel engine ever developed by Cummins. With an output of 4000 hp and more, Cummins' new QSK95 is the world's most powerful high-speed diesel engine.

How much does a 6.7 Cummins cost?

The new 1000-lb-ft Cummins 6.7-liter diesel is an $11,795 option for 3500 model trucks only; the standard Cummins diesel is a $9,100 option. Ram 3500, 4500, and 5500 chassis cab trucks start at $36,445.

Is Cummins better than Duramax?

Both the 6.6L Duramax and 6.7L Power Stroke are V8 engines, with the 6.7L Cummins being an inline six-cylinder diesel engine. Horsepower and torque numbers are similar between the three diesel engines, but the Cummins engine leads the pack with its torque rating breaching the four-figure threshold.

How much boost can a stock 6.7 Cummins handle?

The stock head bolts should be good up to about 45psi back pressure, and 38 psi boost.

Is Nissan discontinuing the Cummins?

The Nissan Titan XD diesel pickup, which packed 555 lb-ft of torque and a theoretical towing capacity of 12,830 pounds courtesy of a 5.0-liter Cummins turbodiesel V8, will be discontinued for the 2020 model year, according to a report by Automotive News. It's that there aren't that many Titan buyers in the first place.

How many cylinders is a 6.7 Cummins?

six

How many miles can a Cummins last?

The engine may last forever. The DODGE (or maybe Cummins) website speaks about the TD lasting 350,000 miles (mean) between overhauls, 100,000 miles longer than the GM or FORD.

What is the best diesel engine?

In the Company of Greatness - 10 Best Diesel Engines
  • Wartsila-Sulzer RTA96-C.
  • Caterpillar C12 Super Truck Racing Engine.
  • GM 6.6L Duramax.
  • International 7.3L Power Stroke.
  • MTU 16V-4000.
  • VW 5.0L V-10.
  • Detroit Diesel Series 60.
  • Rudolph Diesel's First Working Engine. The One That Started It All.

What oil does 6.7 Cummins use?

Our top pick for the Best oil for Cummins 6.7 engines is the Valvoline Premium Blue 15W-40 Heavy Duty Motor Oil, which is specifically called for by the factory for use in temperatures above 0-degree Fahrenheit.

How often should you change the oil in a 6.7 Cummins?

6.7L Cummins Maintenance Schedule
Service ProcedureInterval(s)
Replace engine air filter30,000 miles/24 months
Change engine oil & oil filter2007.5 - 20127,500 miles/6 months
2013 - 201915,000 miles/6 months/500 hours
Replace crankcase ventilation (CCV) filter2007.5 - 201867,500 miles/54 months

Who is the largest manufacturer of diesel engines?

Biggest companies in the Heavy-Duty Diesel Engine Manufacturing industry in the US. The companies holding the largest market share in the Heavy-Duty Diesel Engine Manufacturing industry include Caterpillar Inc., Cummins Inc. and Navistar International Corporation.

How many turbos does a 6.7 Cummins have?

The Cummins 6.7L inline-six turbo diesel is offered in two variants; standard output 370 horsepower (850 pound-feet of torque) and high output 400 horsepower (record-setting 1,000 pound-feet of torque).

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