How Long Does a Cummins Engine Last? (Explained)

A Cummins engine has made a name for itself by delivering long lasting service as well as high-quality performance. Their engines are known to last a long time.

In this article, we will take a look at how long a Cummins engine lasts and what we can do to make it last even longer. Read ahead to learn more about it. 

How long does a Cummins engine last?

A Cummins engine lasts a long time. This engine is highly reliable and has high levels of output. A 5.9 liter Cummins engine can go on for about 300,000 to 400,000 miles. In addition, a 6.7 liter engine can churn out about 350,000 miles without any modifications being made.

Cummins engines have been known to last a long time. These engines are generally known for their long-lasting service and top-notch performance. So they have made a name for themselves among a wide customer base.

The Cummins brand has been a very reliable name in the market for quite some time now. Cummins engines last a long time. The 5.9 liter engine lasts to churn out about 300,000 to 400,000 miles.

On the other hand, a 6.7 liter engine lasts to churn out about 350,000 miles even if you have done no modification in the engine. So needless to say, the Cummins engines are designed to be highly powerful and deliver great levels of output.

Different Cummins engines have different service times. Let’s take a look at how long the following Cummins engines will last:

5.9 Cummins:

The 5.9 Cummins engine is one of the first members of the Cummins B-series engine. This engine is used in light truck vehicles. This is a very reliable engine and its turbos are very reliable as well.

This engine can even give you life-long service as well. However, you will have to note that the engine will not be able to serve you with tremendous horsepower potential.

A 5.9 cummins engine will last a long time. It will be able to churn out about 300,000 to 400,000 miles without any modifications. And with modifications and additional services, you can further prolong its services.

6.7 Cummins:

A 6.7 Cummins engine is one of the most powerful engines in the market. You can rely on this engine for long-lasting services. It is an exceptionally quiet engine that is equally powerful and smooth at the same time.

A 6.7 cummins engine will last a long time. This engine will last to churn about 350,000 miles without any modifications. And if you run some modifications in this engine, it will last even longer.

Cummins ISX:

A Cummins ISX engine will last you about 15 years even if you have done no modifications in the engine. The engine in its very basic form will be able to churn out about 20,000 to 25,000 hours. It is a million-mile engine.

How many hours will a Cummins last?

Different models of Cummins engines last to serve different ranges of time. Let’s take a look at how many hours the following Cummins engines will last:

5.9 Cummins:

A 5.9 Cummins engine will last about 20,000 hours on average. But it is supposed to last even longer if you can run decent maintenance throughout its service time.

The engine can last up to 300,000 to 400,000 miles.

6.7 Cummins:

A 6.7 Cummins engine will last about 20,000 hours with decent maintenance. And if you can incorporate modifications, you can further prolong its service time.

It also has a mileage between 350,000 to 500,000 miles. So you can expect a very reliable service from this engine.

Cummins ISX:

A Cummins ISX engine will last up to 15,000 miles with decent maintenance. You will have to ensure that the engine receives regular maintenance if you want to prolong its service even longer.

You can also incorporate modifications and more in order to make the engine last even longer.

How long will a deleted 6.7 Cummins last?

A deleted 6.7 cummins engine has significant health implications and brings only good news for the planet. But how does it reflect on the vehicle? We will find that out by learning the longevity of a deleted 6.7 cummins.

A deleted 6.7 cummins can last a mileage between 75,000 to 300,000 miles, depending on the vehicle that we are talking about.

But you will have to ensure that the engine undergoes good maintenance and minimal extended idling during that time. In addition, you will have to ensure complete regen cycles during that time. 

How to make your Cummins last forever?

Here are a few things that you can do in order to make your Cummins last forever:

Stick with the factory parts:

In order to make the Cummins last forever, you will have to ensure that the factory parts stay. The original factory fluids, filters, and components will ensure that your Cummins engine is in good condition until the end.

So you should not venture outside the original factory components if you want your Cummins engine to last forever.

Don’t eliminate fuel filter changes:

You should not remove the fuel filter changes. You should not stretch the fuel filter changes or stick them to the OEM replacements if you want the Cummins to last forever.

Always use quality fuel:

You should always use quality fuel when you’re working with the Cummins engine. This is a very important part in order to ensure that your engine lasts for a long time.

So always ensure that you’re using fuel from a highly-frequented fuel station in order to ensure best quality fuel.

What is high mileage for a Cummins diesel?

A high mileage for a Cummins diesel ranges between 350,000 to 500,000 miles. Cummins diesel engines are generally known to last a long time. With decent maintenance and some modifications, you can even make them last a lifetime.

A high mileage Cummins engine will last about 20,000 hours with decent maintenance. Some consumers will get a higher period of service with decent maintenance.

The average mileage of a Cummins engine is quite high in itself. These engines are designed for heavy duty performance so you will not have to worry about mileage in general.

But if you’re specifically looking for a mileage on the higher end, then this engine is the right choice for you.

Are Cummins engines reliable?

Yes, Cummins engines are reliable and highly durable. They can last a lifetime if you can take proper care of them. Cummins engines are originally designed for heavy duty tasks. So they are built to carry out some of the most demanding automobile work.

Power and longevity:

The Cummins engines are designed for power and longevity. Cummins engines will serve you heavy duty performance for a long time without any trouble. They have incredible towing capacity as well.

Reliability and durability:

The Cummins engines are designed for reliability and durability as well. These engines are designed to deliver long piston strokes that will enhance the torque of the automobile.

In addition, the engine has a very simplistic design. It does not require much after-treatment system which further adds to customer convenience.

The Cummins engines take pride in their simplistic performance which makes them a very lucrative choice for the customers.

Designed for industrial use:

The Cummins engines are very powerful. They are designed for industrial use. They can take a great load and still deliver incredible performance without any trouble.

​​What year Cummins is most reliable?

Cummins engines are known to be highly reliable. These engines will serve you with incredible performance for a long time. All you will have to worry about is maintenance and taking the right care of the engine.

With the right maintenance, the engine can even last you a lifetime. It is one of the most reliable engines of all time. But there are some models that have surpassed all the other engines.

The best years for the Cummins engines are 1996-1998, 2006-2007 and 2010-2011. These engines have delivered the customers with incredible performance and heavy duty service.

Final thoughts

A Cummins engine is designed to last a long time. These engines are incredibly powerful and reliable, so you can depend on them for heavy duty performance and longevity. With the right maintenance and modifications, these engines may even last you a lifetime.