If you're wondering how long will a Cummins six. 7 last , the short response is that many owners expect to see at least 300, 000 to 400, 000 miles before any major internal work is required. But honestly, if you hold out in any diesel forum or talk to guys which haul for a living, you'll listen to stories of these things hitting five hundred, 000 and even a million miles along with the original wedge and rotating set up. It's a beast of an engine, but like anything else with a lot of relocating parts, that longevity isn't just presented with to you on a silver platter—you've have got to earn it.
The six. 7-liter Cummins provides been the very center associated with the Ram heavy-duty lineup since mid-2007. It replaced the particular legendary 5. 9, and while this brought in more complex emissions systems, this kept the primary philosophy that made Cummins famous: a heavy-duty, inline-six style that's built more like a tractor engine than a car engine.
The 300k, 500k, and Million Mile Milestones
Within the diesel world, 100, 000 miles is basically just the engine getting "broken within. " While a gas engine might start feeling a bit tired from that point, a 6. 7 Cummins is usually simply hitting its step. For a typical owner who uses the truck with regard to a mix associated with daily driving plus occasional towing, seeing 300, 000 miles is nearly a baseline expectation, offered they aren't neglecting the basics.
When you start talking about five hundred, 000 miles, you're entering the place of "hotshotters"—guys who else pull trailers across the country for a dwelling. These engines thrive on the road under load. The constant heat keeps the filters clean and prevents the carbon dioxide buildup that kills engines that only see short journeys to the grocery store store.
As for the million-mile club? It's real. There are plenty of 6. 7s on the market that have hit seven numbers. Usually, by that will point, the truck's body is falling apart around the particular engine, however the Cummins itself continues to be chugging along.
The reason why the Inline-6 Design Wins
One particular of the biggest reasons people ask how long will a Cummins 6. 7 last is because they've heard about the reliability of the inline-six (I6) configuration. Unlike the OF V8 engines found within Powerstrokes or Duramaxes, the Cummins has fewer moving components. You've only obtained one cylinder mind, one head gasket, and two less connecting rods plus pistons.
Because it's an I6, there is a ton of area inside the engine block for massive main bearings. The crankshaft is massive, and the linking rods are beefy. Everything about the particular internal geometry is definitely designed for durability over high-RPM performance . It produces peak torque at really low engine speeds, indicating it doesn't need to work nearly as hard to move a heavy fill. For the engine doesn't need to scream at 4, 000 REVOLTION PER MINUTE to obtain a job done, it merely longer lasting.
The particular Role of Servicing (The "Don't Skip" List)
In the event that you want in order to make sure your Cummins continues as long because possible, you can't treat it like a Honda Civic. These engines possess specific needs.
Clean Fuel will be Everything
The particular high-pressure common rail (HPCR) system within the 6. 7 is definitely an engineering marvel, but it's also extremely sensitive. The injectors fire at substantial pressures, and actually a tiny bit of dirt or even water can destroy them. Most men who hit high mileage change their energy filters every ten, 000 to fifteen, 000 miles religiously. In the event that you get a bad batch associated with diesel and your own filters are outdated, you're looking with a multi-thousand-dollar maintenance bill for brand spanking new injections.
Oil Changes and Quality
It sounds obvious, but skipping oil changes on a diesel is a death sentence. Diesel oil gets filthy fast because of soot. Over time, that soot gets abrasive. Stick to a high-quality synthetic and even follow the severe service schedule if you undertake any towing.
The CCV Filtration system
One often-overlooked part is the particular Crankcase Ventilation (CCV) filter. If this particular gets clogged, it builds backpressure within the crankcase, which could lead to oil leaks or actually turbo seal failing. It's a simple fix, usually every 60k miles, however it saves a lots of headaches.
The Emissions Hippo within the Room
We can't speak about how long will a Cummins 6. 7 last without addressing the emissions equipment. Considering that 2007. 5, these engines are actually outfitted with Diesel Particulate Filters (DPF) plus Exhaust Gas Recirculation (EGR) systems. Within 2013, they added Selective Catalytic Reduction (SCR) which uses Diesel Exhaust Liquid (DEF).
These systems are usually the first things to "break" on a 6. 7 Cummins. While the base engine might be good for 500k kilometers, the emissions gear may need cleaning or even replacement at 150k.
- EGR issues: The EGR valve can obtain "sooted up, " especially if the particular truck spends a lot of period idling. This can lead to reduced fuel economy and rough running.
- DPF blockage: If the truck doesn't stand up to operating temperature frequently enough to perform a "regen" routine, the filter may plug up.
A lot of guys choose in order to "delete" these systems for off-road use to increase long life, but even when you retain it stock, you can keep your system healthy simply by operating the truck really hard. These engines hate light-duty work; they need to get sizzling and stay warm.
Common Hurdles to High Miles
Even a legendary engine has its weak areas. If you're striving for that 400k-plus mark, keep an eye on these specific issues:
- The CP4 Pump (2019-2020 models): Intended for a couple associated with years, Ram switched to the Bosch CP4 high-pressure fuel pump. It had a nasty habit of failing and delivering metal shavings about the same fuel system. Memory eventually issued a recall to move back to the tried-and-true CP3 pump. When you have one particular of these years, make sure that recall work had been done.
- Grid Heater Bolt: There's a known concern where a bolt on the grid heater can vibrate loose, fall directly into the intake, plus destroy a piston. It's rare, but it's a "catastrophic" type of rare. A lot of high-mileage seekers set up an aftermarket solution to eliminate this risk.
- Head Gaskets: Whilst not common on stock vehicles, if you add a "tuner" and start pushing 50+ POUND-FORCE PER SQUARE INCH of boost with out upgrading to mind studs, you're going to blow a head gasket. If a person retain it stock, the particular factory seal is usually solid intended for the life from the engine.
How You Drive Matters More Than A person Think
If you want in order to know how long will a Cummins 6. 7 last, look at your driving habits. Idling could be the silent killer of modern diesels. When the particular engine idles, this doesn't get sizzling enough for comprehensive combustion, that leads to carbon buildup upon the valves and in the turbo.
If a person use your pickup truck as a "mall crawler" or simply for short outings to operate where the needle barely moves off the chilly mark, you're likely to have issues course of action sooner than someone who hauls a 5th wheel throughout state lines every single weekend. If you have to bored, use the "high idle" feature to help keep the cylinder temps up.
Conclusions on Longevity
At the finish of the day, a 6. 7 Cummins is one of the almost all reliable engines ever put in a pickup truck. It's overbuilt in all the right places. If you stay on best of the fuel filters, use high-quality essential oil, and also use the truck regarding what was built for—pulling weight—there's no reason you shouldn't discover three hundred and fifty, 000 to 500, 000 miles .
Sure, you may have to replace a water pump, an alternator, or probably a turbo actuator along the way. But the "iron" part of the engine—the stuff that actually matters—is built to outlast your interest in the truck. So, if you're looking at an used one along with 150, 000 miles and contains a strong maintenance record, don't sweat it. It's probably just getting started.