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Best Diesel Engine Cleaner: Our 2019 Guide and Reviews

Best Diesel Engine Cleaner
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Many of us in North America own diesel-engine cars and likewise know the importance of cleaning our vehicle’s engines with the best diesel engine cleaner we can find. A clean engine is a happy engine, and if you keep it up-to-date, your diesel car will last longer and run better.

There are so many brands of diesel engine cleaners on the market today that it can be difficult to know which is the best one to buy. We’re here to help! We have reviewed the top diesel engine cleaners from the major brands. Our detailed guide about diesel engine cleaners should shed more light about them so you can feel confident about buying the right one.

Quick Look: Our Top Picks

Diesel Engine Cleaner NameQualityPriceRating
Hot Shot’s Secret P040432ZA$
Opti-Lube XPD Diesel Fuel ImproverA++$$$
Howes 103060 ‘Diesel Treat’ Diesel Conditioner and Anti-GelA++$$
Stanadyne Diesel Performance FormulaA++$$

What to know about your diesel engine

Both diesel and petrol engines need to be cleaned regularly in order to avoid major damage and poor performance. However, an interesting thing to note is that diesel engines are far less prone to developing unclean buildups than petrol engines. If an engine has unclean buildups, it can cause your engine to lose power, not start-up as it should, produce an awful sound while running, consume a large amount of fuel, and yield a lot of exhaust smoke. It is important that your diesel engine is regularly cleaned and that you keep up-to-date with all of the maintenance checks it needs. This will provide you with a vehicle that is safer and ready to conquer long drives.

Other reasons to use a diesel engine cleaner

Using the best diesel engine cleaner you can find will help the overall ride of your car. It will also improve the longevity of the engine over time. But even more importantly, it is crucial to save you money in the long run. If you are always looking after the maintenance of your engine and using top-of-the-line cleaning materials, there won’t be major problems in the near future.

We all know that car problems can add up and eventually there are times you may put more into fixing your car than what you paid for it–this is something we want you to avoid! That is why it is crucial that you not only clean your engine regularly, but also buy the best cleaning products to ensure your engine is getting the care it deserves.

Diesel engines are now a lot cleaner than they originally were. Due to government regulations, diesel engines now have special emissions control the equipment to produce clean air. Every diesel engine is now built with things such as particulate traps and more filters to trap any black smoke that was at one time being pushed into the air. This provides a much more efficient engine and is why we are seeing a rise in purchases of diesel engine vehicles. With the trapping of the smoke, it is essential to clean your filters and clean out the engine to avoid early engine failure.

The Best Diesel Engine Cleaners

Diesel Engine Cleaner NameQualityPriceRating
Hot Shot’s Secret P040432ZA$
Opti-Lube XPD Diesel Fuel ImproverA++$$$
Howes 103060 ‘Diesel Treat’ Diesel Conditioner and Anti-GelA++$$
Stanadyne Diesel Performance FormulaA++$$

Hot Shot’s Secret P040432Z Diesel Extreme Clean and Boost – 32 fl. oz.

Hot Shot-5be9f761d59ef

The first diesel engine cleaner on our list today is also the most affordable option. We want to give you a wide range of products and prices so that even if you are on a tight budget, you can still keep your diesel engine clean. With a product that is cheap, we want to make sure that it does not have a huge lack of resources or features.

Hot Shot’s Secret may not be the most recognized brand, but they are known to make products that work and don’t break the bank. This diesel engine cleaner has been built to clean out your tank, the lines, and the injectors surrounding the engine. It also removes any excess water from your engine system to avoid any damage. This will also stabilize your fuel, and boost the cetane levels in your engine.

This liquid is meant to be a form of a lubricant for your fuel pump and the injectors of the car; it will keep them well-lubed for maximum effectiveness. As well, this product will coat the entire engine and all the lines, while providing a shield against rust and corrosion.


  • Extremely affordable
  • Completely works
  • Makes the engine less noisy and clean
  • A bottle of magic
  • Great features for the low price


  • Known to have gray smoke come out of exhaust after first use of itBUY THIS ONE

Opti-Lube XPD Diesel Fuel Improver: 1 Gallon without Accessories Treats up to 512 Gallons

Opti-Lube XPD Diesel Fuel Improver: 1 Gallon without Accessories Treats up to 512 Gallons-5be9f763a6894

From the least expensive product, we are now moving onto the most expensive product on the list: the Opti Lube Diesel Engine Cleaner. With a more expensive option, we want to make sure the price justifies all the features included with the product.

This product has enhanced-lube action to reduce the amount of wear throughout your fuel system. It will improve how long your fuel will last and increase the power of your engine. All of your injectors will be clean and it will prevent any rust or corrosion build up throughout the engine. It will double the life of your diesel fuel and can be used with emission systems of any vehicle on the market today.


  • Takes great care of your engine
  • Offers a thorough clean of all of the parts
  • Fantastic, especially for injectors
  • Improves lubricity


Howes 103060 ‘Diesel Treat’ Diesel Conditioner and Anti-Gel – 64 oz.

Howes 103060 -5be9f7650ea73

This Howes Product brings us back to some of the more affordable diesel engine cleaners on our list. Howes is a very reliable brand that we have come to trust. This diesel conditioner will lower the cold filter around 20°. This will keep your engine working in top-notch shape throughout the year.

Howe’s diesel cleaner is primarily meant to de-stress the engine during cold weather. It will help your engine work to satisfaction, especially when it is below freezing outside. It can be used in all diesel and biodiesel engines on the market today.

As well, another goal of this product is to prevent any gelling from the fuel and to increase the overall power of the engine. More importantly, it will utilize the fuel more effectively so you won’t have to gas up as much.


  • Treats diesel incredibly well
  • Really well priced
  • Prevents any sort of gelling


  • Primarily for winter months; should buy an alternative for the warmer times of the yearBUY THIS ONE

Stanadyne Diesel Performance Formula 64 oz.

Stanadyne Diesel Performance Formula 64 oz.-5be9f76674aa1

This Stanadyne product is again, one of the more competitively-priced diesel engine cleaners on our top four list. Stanadyne is a great company that we have been using for years. We rarely hear a complaint about them.

Stanadyne has the approval of the top OEMs such as GM, Ford, Deere, and Navistar. With fantastic manufacturing companies applauding this product, you know it must do the trick. It is one of the best-performing products on the market today.

This diesel performance formula is to be used in all of the seasons and is an all-purpose fuel additive that can tackle any problem that your diesel engine may have. It completely meets the Cummins L10 test for being a clean product.


  • Contains zero alcohol
  • Will reduce wear of your engine
  • Cleans and protects your engine great
  • Stabilizes your fuel


  • One of the best on the market, again may be a bit pricier, but we think it is worth itBUY THIS ONE


As we stated before, it is crucial to keep your diesel engine clean. Not only will it save you money, it will also improve what is even more important: your safety. Anyone with a vehicle has the nightmare that their engine stops in the middle of a high-speed scenario. While it is not common, it is more likely to happen if your engine is not taken care of. A car is like anything you own–the less you take care of it, the less time it will last.

To avoid having your car break down and to ensure it lasts you a long time, we fully recommend trying any of the four products listed above. They are all fantastic, most are reasonably priced, and they are definitely going to help you maintain the cleanliness of your engine. What’s even better is that they are easy to use.