If you're asking how long will a 6. 7 cummins last , you're probably looking with regard to more than just an advertising brochure answer. You want to understand if that truck sitting in your own driveway—or the one particular you're considering buying—is going to maintain chugging along past the 300, 000-mile tag without bankrupting a person. The short response is that these engines are complete tanks, often achieving 350, 000 mls before needing any kind of serious internal function, but there's a wide range of "it depends" wrapped up in that number.
The 6. 7L Cummins inline-six has been the heart of Ram heavy-duty trucks since 2007. It replaced the renowned 5. 9L, even though it brought more power and torque, this also brought more intricacy. Still, the primary of the engine—the block, the crank, as well as the rods—is constructed with a heavy-duty mindset that you simply don't see in gas engines.
The particular 350, 000-Mile Standard
When folks speak about diesel durability, they often bring up the "B50 life. " With regard to the 6. seven Cummins, that amount is generally cited with 350, 000 kilometers. What that in fact means is the fact that 50% of these motors are expected to reach that miles without a major teardown or change.
In the real planet, it's not unusual to see "hotshot" drivers—guys who pull trailers across the country for a living—clipping past five hundred, 000 miles. On the flip aspect, a truck that will only does short trips towards the grocery store might begin having issues at 120, 000. The particular engine itself is definitely rarely what does not work out; it's usually the particular stuff bolted into it. The cast-iron block out and cylinder head are incredibly strong, also because it's an inline-six design, right now there are fewer relocating parts than a V8, which in theory reduces the number of items that can go wrong.
Exactly why Maintenance Isn't Optional
If a person want to reach that legendary high-mileage status, you can't treat your truck like a Corolla. You need to stay on top of the particular basics.
Oil Changes plus Quality
It sounds basic, yet oil may be the lifeblood of these engines. The 6. seven Cummins holds about 12 quarts associated with oil. Because associated with the emissions systems, specifically the Exhaust Gas Recirculation (EGR), soot can develop up in the particular oil faster as opposed to the way it did upon older diesels. When you're towing heavy or idling a lot, you ought to be looking at changes every seven, 500 miles, actually if the guide says you may go longer. Using a high-quality man made oil can assist keep those inner components pristine.
The Fuel System is Sensitive
Modern diesel fuel systems operate at incredibly high pressures—up to 30, 500 psi. Even a tiny bit associated with water or grime in the fuel may wreck your injections or the high-pressure energy pump (the CP3 or the more controversial CP4). Most seasoned owners will tell you in order to change your fuel filters almost every other oil change, or each 15, 000 miles. It's a cheap insurance policy when compared with a $5, 000 fuel system maintenance.
The Exhausts Elephant in the particular Room
When we talk about how long will a 6. 7 cummins last , we have to address the emissions products. This is where the majority of the "unreliability" issues originate from. To meet federal standards, these trucks use a Diesel Particulate Filter (DPF), an EGR system, and Diesel powered Exhaust Fluid (DEF).
The EGR system recirculates exhaust system gases back in the intake to lower burning temperatures. The issue? It also puts soot into your consumption manifold. Over period, this can clog things up and cause sensors to fail. Then there's the DPF, which catches soot within the exhaust. When you don't drive the truck on the road long enough for it to "regen" (burn off that soot), the filter will get plugged.
Many owners find that the engine wedge itself is good for half a million miles, however the emissions components may need servicing or alternative every 100, 000 to 150, 500 miles. It's just the cost of carrying out business with a modern diesel.
Driving Habits: Motorway vs. City
The 6. seven Cummins is a workhorse, not a grocery getter. If you use it for a five-minute commute daily, you're actually harming the engine. Petrol need to obtain up to working temperature to operate efficiently. When they run cold, these people produce more soot, which clogs the emissions system and can lead to "fuel dilution, " where unburnt diesel gets past the particular piston rings and thins the essential oil.
If you're mostly driving on the highway and pulling a fill, the engine stays hot, the DPF stays clean, plus the engine stays happy. High-mileage Cummins engines happen to be discovered in trucks that spend their lifestyles on the interstate. If you're mainly doing city traveling, you might want to reconsider when a diesel is actually the correct fit for you.
Common Weak Points to Watch
Simply no engine is ideal, and the six. 7 has a few "known issues" that crop up since the miles get.
- Turbo Actuator: The VGT (Variable Geometry Turbo) is great for low-end torque and acting as an wear out brake, but the electronic actuator that controls it really is a frequent failure point. You'll know it's going in case your exhaust brake stops functioning or you obtain a check motor light.
- Grid Heater Bolt: This is a bit associated with a "boogeyman" in the Cummins neighborhood, but it's a real risk. A bolt for the consumption grid heater may vibrate loose and get sucked into the engine, which is definitely an immediate death word for a cylinder. Many owners install an aftermarket "delete" or a different heater style as soon as the warranty will be up.
- Water Pump: The factory water pumps aren't the best. It's a good idea to swap it out for a heavy-duty version if you see any weeping or leaks.
Transmission Longevity
We can't discuss the engine without mentioning the transmission. Most of the time, the answer in order to how long will a 6. 7 cummins last is "longer than the transmission it's attached to. "
For those who have the 68RFE automatic transmission, you require to be cautious with tuning and heavy towing. It's a decent gearbox, but it doesn't handle extra horsepower very well. The Aisin AS69RC, found within Chassis Cab versions and some high-output 3500s, is much beefier and usually lasts much more time under heavy stress. And, obviously, there's the G56 manual (discontinued after 2018), which is liked by purists but has its own limits regarding the dual-mass flywheel.
Is 200, 000 Miles "High Mileage"?
In the wonderful world of gasoline engines, 200, 000 miles is generally the end of the road. For a 6. 7 Cummins, it's more like middle age. In the event that you're taking a look at a good used truck along with 200k around the clock, don't be instantly scared off. Look at the nonproductive hours.
A truck may have 200, 000 miles but eight, 000 idle hrs, which means it spent a lot of time sitting and working. High idle hours are often even worse than high kilometers because of the soot buildup all of us talked about. A "clean" high-mileage truck that was used for long-distance trucking is often a better buy than a low-mileage pickup truck that spent its life idling upon job sites.
The Verdict
So, how long will a 6. seven cummins last ? If you keep it stock, modify the fluids carefully, and actually use it for dragging or highway driving, there is simply no reason you shouldn't see 300, 500 to 400, 000 miles.
The core associated with the engine will be essentially a medium-duty commercial powerplant packed into a pickup truck body. It's overbuilt intended for what many people make use of it for. Indeed, you might have got to replace a turbo actuator or a water pump motor along the method, and the exhausts gear might provide you with a headache ultimately, but the "spinning bits" inside the particular block are made to go the length. Treat it like a tool, keep it clean, and it'll likely be the particular last truck motor you need regarding a very long time.