Duramax Engine Replacement Cost | A Complete Breakdown

Owners of Duramax-powered vehicles are no strangers to the hefty price tag that comes along with owning one. 

But even if you’re used to shelling out big bucks for repairs and upgrades, a new Duramax engine replacement cost may still come as a shock. 

Luckily, there are ways to bring that cost down. In this post, we’ll explore some of those options and help you find the best deal on a new Duramax engine.

Duramax Engine Replacement Cost

How Much Does it Cost to Replace a Duramax Engine?

Replacing a Duramax engine can be a significant investment, with costs ranging from $15,000 to $25,000. 

The exact cost will depend on factors such as the make and model of the vehicle, as well as the year and condition of the engine. 

For example, a newer engine in good condition will be more expensive than an older engine that needs to be rebuilt. 

Can You Buy A Duramax Engine?

The answer is yes – you can buy a Duramax engine. 

There are a few different ways to go about it, but the most important thing is to make sure that you’re getting a quality engine. 

You can find Duramax engines for sale from a variety of sources, including online retailers and auto parts stores. Or, if you’re looking for a more unique option, you can even find Duramax engines that have been salvaged from salvage yards. 

How long Does Duramax Engine Last?

The Duramax engine is known for its high performance and reliability. On average, a Duramax engine can last between 250,000 and 300,000 miles with proper maintenance. 

This makes it one of the longest-lasting engines on the road today.

Is Duramax Diesel A Good Engine?

Duramax engines that are 6L V8 Turbo Diesel design deliver more power and torque than your standard engine. And because they’re turbocharged, they’re also able to provide better fuel economy. 

But perhaps the most impressive thing about Duramax diesel engines is their longevity. With proper care, these engines can easily last more than 200,000 miles. 

In fact, some owners have even reported getting more than 300,000 miles out of their engine. 

How Much Should It Cost In Labor To Replace A Diesel Engine?

The cost of labor to replace a diesel engine will vary depending on the shop you visit and the hourly rate they charge. 

However, most shops will charge between $90 and $150 per hour for this service. If you are charged at the lower end of this range, it will take approximately 11 hours to replace the engine, which will cost between $990 and $1,650. 

If you are charged at the higher end of this range, it will take approximately 8 hours to replace the engine, which will cost between $1,120 and $1,800. 

In either case, it is important to remember that these are only estimates and your actual cost may be higher or lower than these ranges.

Which Duramax Engine Is Best?

There are four different Duramax engines, each with its own benefits.

The 6.6L Duramax LB7 is the most powerful, with 300 horsepower and 520 lb-ft of torque. However, it is also the heaviest and least fuel-efficient of the four engines. 

The 6.6L Duramax LLY is a lighter and more powerful engine, with 340 horsepower and 650 lb-ft of torque. However, it is less fuel-efficient than the LB7. 

The 6.6L Duramax LBZ is the lightest and most fuel-efficient engine, with 360 horsepower and 650 lb-ft of torque. However, it is not as powerful as the other two engines. 

Finally, the 6.6L Duramax LMM is the most powerful and fuel-efficient engine, with 400 horsepower and 800 lb-ft of torque. It is also the heaviest of the four engines.

What Is Considered High Mileage For A Duramax?

When it comes to high mileage, there is no one-size-fits-all answer. Depending on a variety of factors – including make, model, and driving habits – a car may be considered high mileage at anywhere from 80,000 to 200,000 miles. 

For a Chevy Duramax diesel engine, however, the consensus seems to be that 350,000 miles is generally considered high mileage. 

Of course, this number is merely a starting point – some Duramax engines will continue to run strong well past 350,000 miles. 

How Much Does It Cost To Install A New Engine?

How Much Does It Cost To Install A New Engine

Most mechanics will charge between $500 and $1,500 for labour, with the majority of that cost being for the removal and installation of the new engine. 

The cost of the engine itself will also vary depending on the make and model of your vehicle, but you can expect to pay between $1,000 and $4,000 for a new engine. 

Therefore, the total cost of installing a new engine can range from $1,500 to $5,500. 

How Long Does It Take A Mechanic To Replace An Engine?

The average mechanic will need about eight hours to replace an engine. This includes taking the old engine out and putting the new one in. 

However, the exact time will vary depending on the make and model of the vehicle as well as the experience of the mechanic. 

If the mechanic is very experienced, they may be able to do it in as little as six hours. However, if they are less experienced or working on a complicated vehicle, it could take up to 10 hours. 

How Much Does It Cost To Rebuild A Diesel Engine?

The cost of rebuilding a diesel engine can vary depending on the type of engine, the extent of the damage, and the mechanic doing the work. 

Generally speaking, however, it is possible to rebuild a diesel engine for around $20,000-30,000. 

This cost can increase if the engine is substantially damaged or if additional work needs to be done such as replacing pistons or crankshafts. 


If you’re in the market for a new engine, be prepared to spend some cash. Depending on your make and model of car, a Duramax engine replacement cost could set you back anywhere from $15,000 to $25,000. 

However, if you’re lucky enough to find one second-hand, the price may be lower. So before you start shelling out money for a new engine, do your research and compare prices!

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