Best Oil Additives to Improve Fuel Economy

Best Oil Additives to Improve Fuel Economy

Do you want to improve the fuel economy of your car or truck? How about reduce the overall noise of the car?

Oil additives help with fuel economy as well as overall performance of your engine. It is something you should definitely consider if you want to have your car working in great order for years and save a little money at the pump.

What do you need to know about oil additives? Which products have the best reputation on the market? Learn all about it in our guide to the best oil additives!

Features to Consider in Good Oil Additives

Before you buy an oil additive, it’s important to understand what it can do for the engine.
Oil additives help:

  • Reduce friction between engine parts
  • Dislodge contaminants or deposit sludge
  • Reduce emissions by improving the fuel economy

Now that you know the basics, let’s examine a few features that separate one engine additive from another product:

  • Purpose: Not all fuel additives perform all of the above mentioned tasks. Some specialize in one thing or another, while other products are universal and can help improve all three functions of the engine.
  • Formula: Some chemicals in oil additives can make things worse for the engine. It is important to remember that just because the product says it’s a great oil additive for your car doesn’t necessarily mean its safe. Make sure the product is at least EPA certified.
  • Compatibility: The additive must be compatible with the make and model of the engine.

Once you examine the considerations of a great oil additive it is time to start shopping products. You can save time by reading the reviews of our 10 favorite products.

Top 10 Best Oil Additives 2024

1. Sea Foam sf-16 Motor Treatment, 16 oz.

Sea Foam sf-16 Motor Treatment, 16 oz.

Why we like it: It is one of the best oil additives that work with both diesel and gas engines in a variety of vehicles.

Editor’s Rating:

The Sea Foam sf-16 Motor Treatment is hands down one of the best oil additives for older engines. The product comes in a very easy to use and simplified kit.


Sea Foam delivers a top-notch additive formula suitable for 2-cycle and 4-cycle engines. You can the enhancer with cars, trucks, boats, tractors and even small engines.

The formula is produced with one hundred percent pure petroleum. It is designed to varnish deposits and liquefy gum buildup. The formula will also remove and reduce internal engine contaminants.

Sea Foam sf-16 Motor Treatment is PEA and EPA registered.


Here is a list of the complete features of the formula:

  • Cleans injectors
  • Cleans carb jets
  • Stabilizes Fuels
  • Controls moisture in fuel
  • Lubes upper cylinders
  • De-ices engine
  • De-gels engine

You can directly inject the additive. It works best with older engines that have clocked in over 250,000 miles.

The oil additive noticeably enhances engine performance for older engines. Drivers notice the engine also operates quieter and with reduced drag. The formula works equally well for gas engines plagued by issues. Sea Foam sf-16 Motor Treatment can also serve as a lifesaver for small engines. The only knock with the product is it considered less effective for ethanol gas issues.

Additionally, you should only use the oil additive if your engine has at least 5,000 miles. The formula is flammable, but oxygen safe.


Sea Foam sf-16 Motor Treatment is one of the top engine oil additives money can buy. It’s relatively inexpensive to purchase and you can buy in bulk to save money.

The formula works in just about any type of diesel or gas engine, though older engines benefit the most. The results following use are noticeable! Additionally, there are nearly no drawbacks to the product if used correctly and as intended.


  • Excellent for older engines
  • Cost-effective product
  • Eliminates gas problems in smaller engines
  • Effectively gets rid of deposits, gum, and contaminants in engines
  • EPA and PEA certified


  • Flammable
  • Doesn’t fix ethanol gas issues

2. Liqui Moly 2009 Anti-Friction Oil Treatment

Liqui Moly 2009 Anti-Friction Oil Treatment

Why we like it: Liqui Moly 2009 Anti-Friction Oil Treatment is a well-made formula that works as advertised and sold in affordable cans.

Editor’s Rating:

The German-made oil additive primarily reduces friction in engines. The formula is very affordable per bottle and works as intended. If you are looking for an oil treatment that works, particularly for older engines, you should definitely consider Liqui Moly 2009 Anti-Friction Oil Treatment.


We were surprised by how well-made the formula was compared to others on the market. The additive is not nearly as graphite-dense as other similar products. The molybdenum concentration is high without being bogged down by other chemicals. The additive can withstand higher temperatures as a result.

If you are looking for an anti-friction engine oil additive, the best products have tungsten disulphide or HBN. Oil additives with molybdenum come closer. Liqui Moly doesn’t contain tungsten disulphide, yet the chemical formula is in the grapheme family. These oil additives are proven to reduce friction and restore damage.


The Liqui Moly forms a film of lubricant on the surfaces of the engine that causes friction. The ability of the formula protects the engine better than other additives on the shelf. The formula works much better than ZDDP-based products. ZDDP doesn’t form a sealing film unlike graphites.

The moly in the product can reduce friction much better than graphite-based formulas, but not as good as HBN or tungsten disulphide. Liqui Moly 2009 Anti-Friction Oil Treatment is exceptional at treating engines on Prius vehicles. Automobiles like Prius have engines with moly coats on the cylinders. It leads to less of any oil layer between the surfaces of the engine parts. However, you can correct the dilemma by using a moly-based oil additive like Liqui Moly.

Plus, the cans contains the additive are made each year so the formula doesn’t get old sitting on a shelf. Formulas that have been on the shelf for years start to lose their potency.


The oil additive is near perfect for reducing engine friction and minimizing engine noise levels. It doesn’t remove debris or contaminants, but as far as reducing friction it is as good as it gets.


  • Reduces friction much better than graphite-based formulas
  • Very compatible with Prius engines
  • Reduces noise in older engines
  • Long-lasting and durable
  • Affordable oil additive


  • Doesn’t reduce contaminants or debris

3. AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer

AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer

Why we like it: AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer eliminates dry starts and works with other motor lubricants, including oil-based products.

Editor’s Rating:

The additive works on diesel engines in cars, trucks, and tractors. AI Innovations is compatible with both engine oil and transmission oil. It is sold in a giant one-gallon container. The price for such a huge quantity is impressively affordable and will last for awhile.


The Lucas Heavy Duty Oil Additive is mainly an oil stabilizer. It can increase the life of engine or transmission oil by 50 percent. It functions by raising the pressure of the oil inside the engine. The added pressure creates more miles per gallon, and increases the lifespan of the overall engine. Consequently, the stabilizer is really effective at supporting long-lasting engine performance.


AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer can help with dry starts, engine overheating, and similar issues. It is a lifesaver when the engine experiences blow-by issues. The stabilizer is most effective with engines that sputter regular oil. A little of the mixture goes a long way in resolving the issue.

We used the additive with an engine that was experiencing oil loss. Once the additive was poured in the oil loss problem went away. There is no doubt AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer will keep older engines running smoothly and prolong the life of it.

What’s more? The oil stabilizer can reduce the level of oil consumption by the engine. So it will optimize fuel efficiency as much as possible. Because it eliminates dry starts the fuel economy improves and you’ll notice a spike in miles per gallon. We also experienced dramatic results with noise reduction.

The one problem with the oil stabilizer is that it gets very gooey and sticky when it’s cold. So we recommend another product to use during the winter months.


AI Innovations has a great oil stabilizer that will make your engine run efficiently and prolong its life. The price isn’t too bad either.


  • Noise reduction
  • Eliminates dry starts
  • Minimizes engine overheating
  • Get more miles per gallon of fuel
  • Affordable price for large bottle


  • Doesn’t work well in cold weather

4. Archoil AR9100 Oil Additive

Archoil AR9100 Oil Additive

Why we like it: Archoil AR9100 Oil Additive is an excellent formula that suits nearly all types of engines. It is great for reducing friction, noise, and corrosion.

Editor’s Rating:

The oil additive is marketed towards all types of engines. It works with gas and diesel engines, in addition to hydraulics, gearboxes, power steering systems, and differentials. However, we recommend checking vehicle compatibility before purchasing Archoil AR9100 Oil Additive.

You can mix the oil additive with both engine and transmission oil. AR9100 works with any mineral synthetic oil.


Archoil AR9100 contains a substance called Nanoborate. It is an ester and a mild detergent that disperses contaminants in the engine. The cleansing capabilities of the formula will dislodge any level of carbon deposits or sludge in engines. The formula is best applied during a regular oil change. You can also add it to the engine, hydraulics, or power steering oil.


The enhancer delivers advantages in many ways. The addictive is wonderful at reducing both friction and heat. We noticed a significant noise reduction in engine performance as well. Furthermore, the additive will reduce the wear on engine components and extend life.

Additionally, the Archoil AR9100 Oil Additive protects an engine in cold weather. It also protects against dry starts. Drivers will experience improved fuel economy and more power. The vehicle should also produce less heat.

It has better sealing capabilities than most oil additives. The blowby caused by piston rings is very minimal. Archoil AR9100 will also relieve engine pressure and protect against agents that cause corrosion. The formula is really good for injectors on older vehicles. It will definitely eliminate any cold running sluggishness in engines.

Keep in mind: The oil additive is recommended for all engines, but it may not work on some types. It’s important to check your vehicle manual before using the additive.


Archoil AR9100 Oil Additive is a terrific oil additive that not only reduces engine oil deposits, but also eliminates corrosion. The end result is a much quieter and smoother ride.


  • Reduces engine deposits
  • Minimizes noise
  • Eliminates dry starts
  • Gets rid of blowback
  • Works with both gas and diesel engines


  • May not work with all vehicle models

5. BestLine 853796001049 Premium Synthetic Engine Treatment

BestLine 853796001049 Premium Synthetic Engine Treatment

Why we like it: Bestline is a trusted brand for oil additives and this item is one of the most popular products the brand offers.

Editor’s Rating:

Dedicated users of Bestline oil additives claim they are the best brand without question. We don’t know if we would take it that far yet Bestline does have an outstanding reputation. The synthetic engine oil additive is marketed as suitable for all gasoline engines. You can use it with cars, trucks, and motorcycles.


The formula creates an ionically bonded layer of lubricant inside the engine. In other words, the additive coats the parts of the engine in a substance that reduces wear and tear. It results in improved efficiency and high levels of engine performance. The oil additive is highly recommended for improving fuel economy in gas engines. It is also relatively easy to use. Just add one bottle to the engine oil with each oil change.


We experienced highly positive results with the oil additive. The parts on the engine resisted friction with a premium lubricant. We noticed it works best with older engines, though you can begin using it on a brand new car after it reaches 5,000 miles. Though Bestline claims the additive will reduce harmful emissions we were unable to verify if that is true or not.

The oil additive will most likely improve the fuel efficiency of your ride. However, it will not significantly reduce emissions compared to other additives. Regardless, it does prevent the risk of the engine emitting more exhaust because of overheating. The product is also registered with the EPA.

Another major advantage is the product will prolong the life of gas engines. Why? When the friction of moving parts in an engine are reduced the wear and tear is minimal and improves overall lifespan.

Lastly, the Bestline oil additive will minimize the risk of an engine overheating. We highly recommend that you use the product for a road trip, especially in warmer climates. Beware though: the oil additive may not work with all gas engines so check with your user manual first.


The Bestline Synthetic Oil Treatment is an excellent product for improving engine fuel economy and performance. It doesn’t work with all engines though.


  • Improves fuel economy
  • Boosts engine performance
  • EPA registered
  • Prevents overheating
  • Reduces friction


  • Doesn’t work with all gas engines

6. REV X Stiction Fix Oil Treatment

REV X Stiction Fix Oil Treatment

Why we like it: REV X Oil Treatment is a striction reduction oil additive that is suitable for diesel and gas engines. It can release stuck parts without the aid of dangerous chemicals.

Editor’s Rating:

REV X oil additives are advertised as the “original stiction fix.” It’s not an exaggeration. The product lubricates fluids in vehicles for improved performance while not introducing any new chemicals. As a result, it is best used for eliminating unnecessary friction.


The oil additive is designed to work with other lubricating oils in the engine. The formula is free of contaminants such as zinc. Instead, the REV X oil additive works on something known as stiction on your vehicle. Stiction occurs when engine parts rub against each other, and lead to extreme friction and even potential fires.

REV X Oil Treatment is so effective it will even address striction issues in turbochargers and HEUI injectors. Mechanics and knowledgeable drivers prefer REV X Oil Treatment because it does so without requiring the use of harmful chemical strippers in its formula.


The perks of using the oil additive are numerous. For starters, it will increase the horsepower of the engine. You can also expect improved efficiency levels. The additive lowers the operating temperature of the engine to increase performance.

What’s more?

The additive works on lubrication. It is like a catalyst that makes the lubes act better. Drivers can use the oil additive with any other type of lubricant fluid. It works with gear and hydraulic lubricants, plus high-grade lubes.

The oil additive is safe to use with exotic and soft metals. The formula is completely free of graphites, moly, Teflon, or any other harmful chemicals. We also noticed the fuel additive seemed to improve how a vehicle started in cold weather.

The only negative is the price. This oil additive is one of the most expensive on the market.


The REV X oil additive remarkably improved the fuel efficiency and economy in our vehicles. If you can afford it, we highly recommend using the additive.


  • No harmful chemicals
  • Enhances lube power
  • Safe on metals
  • Reduces stiction
  • Improves fuel economy


  • Expensive oil additive

7. Genuine Ford Fluid XL-3 Friction Modifier Additive

Genuine Ford Fluid XL-3 Friction Modifier Additive

Why we like it: It is an OEM oil additive that will never go wrong. Though it is advertised as a product for Ford makes and models, it works on other vehicles as well.

Editor’s Rating:

This is an OEM oil additive made for Fords by the Ford Company. Its main function is to reduce engine noise.

If you have a Ford engine, you can’t go wrong with this product. You can use this oil additive in certain non-Ford vehicles as well.

However, we highly recommend checking compatibility with the vehicle manufacturer. It may be compatible if the engine is similar to Ford engines.


The formula is quite impressive, and not just because it is an OEM product. The oil additive is made for use with limited-slip differentials. It immediately reduce chatter in the hypoid gears. Each bottle of the oil additive has a tapered neck applicator. It is extremely easy to apply as a result. The formula works on the lubricated parts of the engine. It reduces surface friction.


There’s no better oil additive for Ford vehicles than the Fluid XL-3 Friction Modifier. We were surprised by how well the additive reduced the noise levels of the engine. The slip differential chatter was all but eliminated. The before/after results are as clear as night and day.

However, make sure that you understand the oil additive is extremely noxious. It smells rather bad and is potent, so we recommend using a face mask while handling the substance. It will not reduce deposit or rust, yet the performance in other regards is very good.


Genuine Ford Fluid XL-3 Friction Modifier Additive is a rare OEM product. It is hard to find unless you go directly through Ford. However, it is sometimes worth the trouble because it reduces noise and friction very well.


  • Reduces engine noise
  • OEM brand product
  • Eliminate most friction in engine parts
  • Tapered neck applicator


  • Hard to find oil additive
  • Doesn’t dislodge engine sludge

8. Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment

Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment

Why we like it: Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment is a dependable formula that can get added to fuel or oil. The additive works exactly as advertised.

Editor’s Rating:

Marvel oil additive supports all types of engines. Yes, that includes hybrids and GDI. The formula is suitable for conventional, synthetic, 2-cycle, and 4-cycle engine oils. The fuel types it supports includes diesel, gas ethanol, and biodiesel blends.


It is arguably one of the most convenient oil additives we have come across. Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment works with nearly all types of engines. We especially recommend it for engines that operate with ethanol-containing fuel. Why? Ethanol is notorious for causing rust and corrosion.

The additive targets rust deposits and gets them out from under your hood. It is also a top-end lubricant that allows engines to run at full power. The additive can stabilize fuel for months. Drivers can also expect easier start-ups.


We like the oil additive mainly because the results are tangible. You can immediately feel a boost in power and performance. It removes contaminants and other deposits from fuel and engine parts. The difference is most additives only target parts related to the fuel system.

Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment can eliminate nearly 99 percent more deposits than other types of gasoline additives.

As a result, expect to receive expect excellent fuel economy. The product will eliminate blowby and dry starting. The formula is extremely preventative so it targets small things that could transform into bigger issues down the road.

Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment also eliminates nasty exhaust smoke. Therefore, it is good at reducing emissions. The only downside is the blend is slightly more expensive than other oil additives.


If you have a modern car with an advanced system, we highly recommend using Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment. The formula functions well with any type of new engine. We were satisfied with how effectively the oil eliminated deposits. It was also more than adept at preventing corrosion.
In conclusion, if you want a vehicle that burns fuel efficiently and runs smoothly, this is the product we recommend.


  • Works with new engine types
  • Prevents rusting or corrosion
  • Elimnates 99 percent of nasty deposits
  • Reduces exhaust smoke


  • Price on the expensive side

9. Bg MOA Part # 110 Engine Oil Supplement

Bg MOA Part # 110 Engine Oil Supplement

Why we like it: Bg MOA Engine Oil Supplement is a no nonsense oil additive that works with most vehicles. The aftermarket supplier is as good as OEM.

Editor’s Rating:

Bg MOA is one of the more interesting oil additives we’ve reviewed. It works with both synthetic and natural oils. However, the manufacturer doesn’t provide exact specifications for the oil so we suggest double checking with the owner’s manual to make sure your make and model is compatible.


This oil additive is designed by an aftermarket supplier. However, we want to make sure that doesn’t prevent you from considering the Bg MOA Engine Oil Supplement because it performs very well. The protective additive safeguards engines even experiencing extreme temperatures. The formula is especially formulated to counter overheated engines.

The contents first protect the engine from oxidation. Oxidation is known to occur from the frequency of stop-and-go type of driving. In addition to preventing the engine oil to liquidate, the product also prevents the oil from thickening over the long term which causes parts to work harder.

While Bg MOA Engine Oil Supplement is effective in hot climates we caution against colder temperatures. The results varied, but we noticed a little decline in performance in exceptionally gold environments.


We were really impressed by how well the aftermarket oil performed. Additionally, the product is recommended by auto mechanics which helps improve its reputation.

It should be understood right away that the oil additive doesn’t fix all engine problems. It only offers relief when the engine is struggling. We recommend using the formula for relief dealing with friction. The Bg MOA Engine Oil Supplement tends to improve results with older vehicles as wear and tear starts to show. However, we also recommend using it on new vehicles once the mileage hits 1,000 in order to maintain the longevity of the working parts.

Though it reduces friction and dislodged sludge, there is no protection offered from the Bg MOA Engine Oil Supplement against rust and similar problems. The additive can work with both synthetic and non-synthetic oils.


Bg MOA is a highly affordable oil additive that works as promoted. It is nothing fancy yet gets the job done. We recommend it for high temperature settings, and suggest something else for the winter or if you live in an unusually cold environment.


  • Affordable price
  • Protection in hot weather
  • Reduces friction
  • Great for many types of engines


  • Only basic protection is offered

10. XL Nanolube Engine Oil Additive & Nano Treatment

XL Nanolube Engine Oil Additive & Nano Treatment

Why we like it: Another aftermarket with a sterling reputation. It functions exceptionally well in hotter temperatures.

Editor’s Rating:

The relatively new aftermarket brand has introduced a product that is designed to work in both gas and diesel engines. Drivers can mix it with all grades of engine oil without fear of causing additional damage to the vehicle. It’s not too expensive and offers several interesting perks.


The XL Nanolube Engine Oil Additive & Treatment is marketed as a “super nano lubricant.” According to the manufacturer, it can “detox” the engine. It may sound like a lot of advertising fluff yet the additive has proven to perform very well in high temperatures. High heat is known to accelerate sludge buildup, something the XL Nanolube Engine Oil Additive & Treatment attempts to remedy. It will get rid of sludge, gum, and varnish inside engines. The formula can also prevent contaminants that occur between the combustion chamber and piston chamber in engines.


The performance in our opinion is impeccable. The oil additive stabilized the engine and prevented contamination on many levels. It also reduced emissions and we noticed a decline in sour exhaust that was previously a problem on the older vehicle that was tested.

However, it is worth noting that the oil additive is only recommended for engines that are six years or older (or over 75,000 miles). As a result, new car owners will not have a use for the product.

Another highlight of the formula is how it actually sticks to metal surfaces of the engine. There is no drip off which feels like money down the drain with cheaper oil additives. The stick-dry formula prevents you from experiencing dry starts.

There are many other perks as well. Though you can use it with newer engines the improved performance will not be quite as impressive. It is superior at handling hot engines in extreme temperatures. So we definitely recommend it during the summer.

The product works with all types of engines, including aluminum found in Range Rovers. Just make sure you remember it will not address any rust problems.


We definitely got our money’s worth with the XL Nanolube Engine Oil Additive & Treatment. It is new to the market yet definitely worth considering in 2023.


  • Performs well in intense heat
  • Works with many types of engines
  • Removes deposits
  • Great for detoxing the vehicle


  • No rust protection

Guide to Buying the Best Oil Additives

The opinion on oil additives depends on the person you ask. Though there are some that strongly advocate the products others are more reserved. We encourage you to form your own opinion! As a result, we have put together this buyer’s guide to help explain what you can expect to get with the top oil additives on the market.

Understand the Types of Oil Additives

There are different types of oil additives. You should get to know what type before settling on a specific product.

Complete Engine Treatment

The oil additive prevents friction. It forms a protective barrier around engine parts to eliminate excess heat.

Engine Break-In Oil Additive

The additive is combined with engine oil to protect the camshaft lifters in your vehicle. It can also lubricate the valve train.

Engine Oil Stop Leak

The type of oil additive mainly stops leaks in engines by sealing the part that is causing the leak.

Heavy Duty Oil Stabilizer

The oil additive mainly reduces friction. It enhances the lubrication inside the engine to make it run smoother.

High Mileage Oil Stabilizer

As the name suggests, it protects the engine against wear and tear on older vehicles.

Learn about the Chemicals in the Additive

There are a couple of chemicals that are essential to a good oil additive for your car engine:


Zinc in oil additives acts as a performance booster. It mostly benefits older engines.


Phosphorus limits metal-to-metal friction in engines. The chemical prolongs the life of the engine.

The best oil additives are generally blended with zinc and/or phosphorous.

EPA Certification

Some oil additives reduce harmful emissions. Basically, when fuel economy is improved the level of emissions is reduced.

Oil additives that are known to reduce harmful emissions have EPA certification. It also indicates that the oil additive doesn’t contain any harmful substances.

There is an alternative called PEA certification that indicates the same eco-friendliness. So, if you want to make an environmentally-friendly purchase, refer to the EPA and/or PEA certification.

Engine Model

The product should explain on the label what it is designed to support. Some additives are designed for gas, while others are diesel. Some can assist with both types of engines. It is very important to understand if the additive is compatible with your make and model.

Check the user’s manual of your vehicle to find out what type of engine it has to make sure the oil additive is compatible.

Double Check to Make Sure the Oil Additive is Effective

Companies that produce oil additives may guarantee it works for all types of engines. However, your user manual is a better source of verification compared to the promise from the manufacturer or label on the bottle. The user manual will indicate what type of oil additives you can use for the engine. It may even list chemicals to avoid in order to narrow down your search.

Where You Live Matters

Some oil additives can’t withstand certain conditions. Cold weather is notoriously hard on oil and additives. However, most are able to withstand hot temperatures, even extreme heat. So if you live in a very cold place you may find some products are ineffective, or even damaging to the engine.


Oil additives can help improve the performance and fuel efficiency of your vehicle, especially older vehicles, despite some debates that argue they don’t do much for your ride. The most important thing is to make sure the additive is appropriate for your type of engine, and will help solve the issue you are attempting to address.

    2 thoughts on “Best Oil Additives to Improve Fuel Economy

    1. Michael says:

      Are the oil additives only effective with really cheap oil?

      1. Mark says:

        No. In any case, you shouldn’t use poor quality oil. For instance, you might want to use an additive when starting a rare, special engine. If the additive doesn’t work well with high-quality synthetic oil and you plan to change the oil soon, you might then use mineral oil with it

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