Do Diesel Engines Cost More to Maintain?

Diesel engines are more powerful than gasoline engines, but they are more expensive. If you're considering purchasing a diesel engine and have questions about what makes them so much more expensive, you're in the right place because we've researched diesel engine maintenance for you. 

Diesel engines cost more to maintain than gasoline engines because they require routine maintenance and have more expensive replacement parts than gasoline engines. Here are some factors that make diesel engines more expensive than gasoline engines:

  • Oil changes
  • Maintenance checks
  • Replacement parts

Why do diesel engines cost more? What are the pros and cons of a diesel engine? How long will a diesel engine last? Keep reading to learn the answers to these questions and more! 

Repairing of modern diesel engine, workers hands and tool, Do Diesel Engines Cost More to Maintain?

Oil Changes

Oil changes for diesel-powered vehicles usually cost between $60 and $100, whereas gasoline-powered vehicles usually cost between $20 to $40 for an oil change. New oil for diesel-powered vehicles costs more than gasoline-powered vehicles. Diesel engines also run dirtier, so they need oil changes more frequently. The sump, or where the oil is stored, gets dirtier and requires more attention to keep it clean. 

Hand mechanic in repairing car,change the oil close up selective focus

Maintenance Checks

Because gasoline vehicles are more common than diesel vehicles, there are more widely-distributed parts and available mechanics. This makes routine maintenance checks more expensive on diesel compared to gasoline vehicles. Routine maintenance checks are for preventative measures to catch problems early and prevent large and costly issues. Also, with diesel vehicles, you need frequent oil changes and filter changes. 

Replacement Parts

Diesel-powered vehicles have more expensive replacement parts because they aren't manufactured on a large-scale. Combined with additional costs for specialized diesel mechanics, repairing issues with a diesel vehicle will cost you more than a gasoline vehicle. For example, the cost to replace a total fuel injector averages $1,500 for parts alone in a diesel engine. Unfortunately, fuel injectors in diesel vehicles usually go bad every 50-thousand to 100-thousand miles, which can get expensive for repairs and replacement parts. 

Why Do Diesel Engines Cost More? 

Repairing of modern diesel engine, workers hands and tool, Do Diesel Engines Cost More to Maintain?

Diesel engines typically cost $3,000 to $10,000 more than their gasoline counterparts. This is because of several reasons: higher-grade parts, expected long lifetimes, and supply and demand. 

Higher-Grade Parts

Because diesel engines are stronger and have more power than gasoline engines, diesel vehicles need more robust parts to withstand the power output. These higher-grade materials cost more to manufacture and, in turn, increase the initial cost of diesel vehicles. In addition, diesel engines require additional parts such as a turbocharger to boost power levels. 

Expected Long Lifetimes

Diesel engines are built to last a long time. From the parts to the engine's function to the energy conversion, diesel engines are more efficient and typically last over five times as long as gasoline engines. 

Supply and Demand

Diesel engines aren't as popular as gasoline engines, and there are fewer of them made. This makes them less available and able to sell for higher prices. Combined with the less-accessible replacement parts and specialized mechanics, diesel engines are worth more money because of their limited availability. 

How Long Will A Diesel Engine Last? 

A typical diesel engine will last between one-million to 1.5-million miles before major mechanics start having issues. This is an average of 30-years of reliable driving in a diesel vehicle. Diesel engines last so long because of the way they're built. Their parts are more robust than gasoline parts to withstand the additional power the diesel engine produces. Also, diesel engines use spontaneous combustion to create energy, which has been proven to help engines last longer. 

Comparatively, gasoline engines typically only last up to 200-thousand miles before they start having issues.

A mechanic repairing an engine, Do Diesel Engines Have Spark Plugs?

What Are The Pros And Cons Of A Diesel Engine?


Diesel engines typically last much longer than gasoline engines, and they'll likely have fewer major issues for most of their lifetime. On average, diesel engines get 30% more mileage for their fuel than their gasoline counterparts. In addition, diesel engines last over five times longer than gasoline engines and need less expensive maintenance because they're built for endurance and sustainability. 

Diesel engines have increasingly better torque than gasoline engines. This means they can accelerate at much quicker speeds because of the power in their engines. This is especially perfect for hauling trailers or other large loads or even merging onto a busy highway.  



Despite their long lifetime, diesel engines require more expensive maintenance than gasoline vehicles. This includes regular oil and filter changes, preventative maintenance checks, and expensive part replacements. Also, diesel fuel is typically more expensive than regular gasoline, upwards of $0.50 a gallon at times. 

Furthermore, insurance companies usually charge more to cover diesel engines than gasoline engines because of higher labor and replacement parts costs. 

Check out our more detailed post on diesel engines here

Open hood on diesel engine modern car

A Fuel Alternative

If you don't want a diesel or gasoline engine, you can opt to go electric. Electric cars are becoming more and more common, especially with famous brands like Tesla specializing in them. 


One of the biggest advantages of electric cars is that they are much better for the environment than gasoline or diesel engines. They have virtually no emissions and don't use gasoline. Instead, they run off electricity, which is a much cleaner and cheaper energy source. On average, electric cars cost $ .03 per mile to drive compared to $ .15 per mile in gasoline cars. It's estimated that driving an electric vehicle saves the average driver over $1,000 annually on gasoline alone. 

Electric cars have much fewer mechanical parts and therefore have lower maintenance costs. Because they don't run off gasoline and an internal combustion system, they don't require most of the typical parts in a traditional car. The main components of an electric car are the battery, the motor control system, and the electric engine. 


Despite the electric car industry's growth, there aren't nearly as many places to recharge your electric car as there are gas stations. The number of recharging stations is continuing to grow, however, and if you remember to map out your destination, you shouldn't have a problem finding someplace to recharge. 

Even if you find a place to recharge your electric car, the recharging process can take a while, turning a long drive into an even longer one. Depending on the model and the charging station, a recharge could take 30-minutes to several hours. On top brands and models of electric cars, they can have a range between 300 and 400-miles on a single charge. However, lower and more affordable models often have much lower ranges that will stop you more frequently to recharge your car. 

While electric cars are becoming more widespread, they usually cost more than gasoline cars, an average of $20,000 more. It's a steep initial investment, but you can save money over time by cutting out fuel use. 

Check out our more detailed post on electric cars here. 

An electric car charging at a charging station

In Summary

Diesel engines cost more to maintain than gasoline vehicles because replacement parts, labor, and routine maintenance are more expensive in diesel engines. However, the initial purchasing cost and maintenance costs can be outweighed by their fuel economy and long lifetime. We hope you've learned something new about diesel engines and can make an educated decision on whether or not you want to make one your next purchase. 

Here are some of our other posts we think you might like: 

Diesel Vs. Gas Truck - Which is Best for You?

Which SUVs Have Diesel Engines?

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One comment

  1. Oil changes: More expensive because a diesel needs 10 – 15 quarts vs 5 quarts for a gasoline engine. Best to use oil-analysis to determine oil changes, $15 for analysis vs $100+ for an oil change. After market filters can also improve oil duration.

    Turbo chargers: With the prevalence of ‘eco’ engines that are usually 6 cylinder and twin-turbo the argument that a turbo makes a diesel more expensive is a fallacy. Economy requires a turbo.

    Five things really make a diesel more expensive. 1) Initial cost. 2)A diesel has to be designed and built to withstand huge forces that makes it heavier/beefier than its gasoline counterpart. 3) Huge difference in cost of oil changes. 4) A 2x cost for a service at the dealer. 5)Currently (12/22) in my area diesel is $1 more expensive than regular gasoline.

    Other issues like having to lift the whole cab off the truck to repair a diesel truck also adds a huge expense.

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