The 10 Best Oil Additives to Buy in 2018

Reviews

Want to improve the fuel economy of your car’s engine? Reduce overall car noise change?

Then adding an oil additive to the engine would help. Go ahead and read all about how to choose a great oil additive for your car and reviews for some of the best products available in the market.

Most Popular Oil Additive Products to Consider

Before you buy an oil additive, it’s important to understand what it can do for the engine.
Here is a list of three main tasks oil additives perform for engines:

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

Therefore, here is what you need to keep in mind when buying a fuel additive:

  • Intended Task: When traffic Not all fuel additives perform all of the above three. Make sure the one you purchase can perform the task you intend it to perform.
  • No Banned Chemicals: Some chemicals in oil additives can make things worse for the engine. Therefore, make sure the product is at least EPA certified.
  • Compatibility: Above all, the additive must be compatible with the make and model of the engine.

Once you nail down the above three, you will be able to find the best oil additive for your vehicle. You can save time by quickly reading the reviews we have written below.

This table summarizes the products we are reviewing below:

 Oil AdditiveEditor’s RatingVolume per CanSuitable Engines
Sea Foam sf-16 Motor Treatment473 mL
Diesel, Gas
Liqui Moly 2009 Anti-Friction Oil Treatment300 mLDiesel, Gas
BestLine 853796001049 Premium Synthetic Engine Treatment473 mLGas
AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer3.785 LDiesel
Archoil AR9100 Oil Additive473 mLAll
Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment354 mLAll
REV X Stiction Fix Oil TreatmentVariesDiesel, Gas
Genuine Ford Fluid XL-3 Friction Modifier Additive114 mLFord
Bg MOA Part # 110 Engine Oil Supplement325 mLDiesel, Gas
XL Nanolube Engine Oil Additive & Nano Treatment236 mLDiesel, Gas
Without further ado, read our reviews for some of the best oil additives in the market:

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

Why we like it: It’s 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 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.
This oil additive is suitable to use with both gas and diesel in engines.

Formula
Sea Foam boasts a top-notch additive formula suitable for 2-cycle and 4-cycle engines. You can use this with cars, trucks, boats, tractors and even small engines.

This is what the formula is made from:

One hundred percent pure petroleum!

The formula is designed to varnish deposits and liquefy gum buildup. It will remove and reduce internal engine contaminants.

The product is PEA registered and is also EPA registered.

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

  • Clean injectors
  • Clean carb jets
  • Stabilize Fuels
  • Control moisture in fuel
  • Lube upper cylinders
  • De-ice
  • De-gel

The oil additive can be directly injected. It works best with older engines that have clocked in over 250,000 miles.

The oil additive noticeably enhances engine performance for older engines. We could literally experience quieter engines with reduced drag after using this product.

The formula works equally well for gas engines plagued by bad gas issues. If you have been using regular gas on small engines, this product would be a lifesaver.

However, keep in mind that Sea Foam is less effective for ethanol gas issues.

It’s recommended to use this oil additive if your engine has run 5,000 miles or more. The formula is flammable but oxygen safe.

Overall
This 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.

It works in just about any type of diesel or gas engine, though older engines would benefit the most. The results following use are remarkably noticeable.

There are nearly no drawbacks if you use this product as instructed. We were nothing but impressed with Sea Foam oil additive.

Pros
  • Excellent for older engines
  • Cost-effective
  • Eliminates gas problems in smaller engines
  • Effectively gets rid of deposits, gum, and contaminants in engines
  • Easy to use
  • EPA and PEA certified
Cons
  • Flammable
  • Doesn’t fix ethanol gas issues

2Liqui Moly 2009 Anti-Friction Oil Treatment

Why we like it: A well-made formula that works as advertised and comes in affordable cans.

Editor’s Rating: 

This 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, then this would be a great product to consider.

Formula
We were surprised by how well-made this 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.

The Liqui Moly doesn’t contain tungsten disulphide but the chemical formula is in the grapheme family. These oil additives are proven to reduce friction and restore damage.

Performance

The Liqui Moly forms a film of lubricant on the surfaces of the engine that causes friction. Thus, it can protect the engine better than most other additives.

This formula works much better than ZDDP-based products. ZDDP doesn’t form a sealing film, unlike graphites that do.

The moly in this product can reduce friction much better than graphite-based formulas, but not as good as HBN or tungsten disulphide.

But there’s one type of engine this formula is the best for:

Prius engines!

Vehicle models like Prius have engines with moly coats on the cylinders. It reduces the oil layer between the surfaces of the engine parts.

You can enhance that ability with this moly-based oil additive. It’s the most compatible formula.

Plus:

These additive cans are made each year so the formula doesn’t get old sitting on a shelf. Aged formulas may not work.

Overall
This 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 friction goes, this product is money well-spent.

Pros
  • Reduces friction much better than graphite-based formulas
  • Great for Prius engines
  • Reduces noise in older engines
  • Long-lasting and durable
  • Affordable
Cons
  • Doesn’t reduce contaminants or debris
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3BestLine 853796001049 Premium Synthetic Engine Treatment

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

Editor’s Rating: 

There are dedicated users of Bestline oil additive products, who claim it’s the best brand no matter what. Our opinion varies, but we were certainly satisfied with this product.

This synthetic engine oil additive is marketed as suitable for all gasoline engines. You can use this with cars, trucks, and motorcycles.

Formula
This formula results in an ionically bonded layer of lubricant inside the engine. In case you are confused, the additive coats the parts of the engine in a substance that reduces wear and tear.

The result:
Improved efficiency and high levels of engine performance. This oil additive is highly recommended for improving fuel economy in gas engines.

It’s relatively easy to use. Just add one bottle to the engine oil with each oil change.

Performance

We experienced highly positive results with this oil additive. It markedly made the engine parts resist friction.

It works best with older engines. But you can start using this even if your vehicle has been driven for over 5,000 miles.

The brand also claims that this oil additive can reduce harmful emissions. That’s really a bit of a stretch.

This oil additive will most likely improve the fuel efficiency levels of your gasoline engine. But it will not actually reduce emissions significantly.

But the additive does prevent the risk of the engine emitting more exhaust because of overheating. This additive is registered with the EPA.

One major advantage:
This oil additive will prolong the life of gas engines. Reducing friction naturally increases the durability of each engine part.

The Bestline oil additive will also minimize the risk of an engine overheating. This is a great product to use when road tripping in warm climates.

Beware:
This oil additive may not work with all gas engines. It’s important to check compatibility first.

Overall
The Bestline synthetic oil treatment is an excellent product for improving engine fuel economy and performance. It doesn’t work with all engines though.

But when it does work, this oil additive performs phenomenally.

Pros
  • Improves fuel economy
  • Boosts engine performance
  • EPA registered
  • Prevents overheating
  • Reduces friction
Cons
  • Doesn’t work with all gas engines

4AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer

Why we like it: It stops dry starts and works with other motor lubricants, including oil-based ones.

Editor’s Rating: 

This Lucas oil additive works on diesel engines in cars, trucks and tractors. Interestingly, it works with either engine oil or transmission oil.

This oil additive is sold in a giant one-gallon container. The price is impressively affordable and you can use the product multiple times.

Formula
The Lucas heavy duty oil additive is mainly an oil stabilizer. It can increase the life of engine or transmission oil by 50 percent.

This oil additive raises the pressure of oil inside the engine. The result:

You will be able to get more miles per gallon. This oil stabilizer is highly effective for long-lasting engine performance.

Performance

This is a solid product that can help with dry starts, engine overheating, and similar issues. This oil additive can be a lifesaver if the engine has blow-by issues.

This oil stabilizer is best helpful when engines sputter regular oil. Pour some of this in and it will take care of the problem.

We used this additive with an engine that was experiencing oil loss. Once this additive was put in, the oil loss problem went away.

It’s great for keeping older engines running smoothly. It would definitely prolong the life of the engine.

What’s more?
This oil stabilizer can reduce the level of oil consumption by the engine. You can be sure that the engine fuel economy is decent with this oil stabilizer.

You can increase miles per gallon by starting to use this. It would eliminate dry starts even if the engine is older.

We also experience dramatic results with noise reduction. The additive makes everything run smoother and also quieter.

The downsides:
The one big problem with this oil stabilizer is that it gets very gooey and sticky when it’s cold. You might want to try a different product for winter conditions.

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

Pros
  • Noise reduction
  • Improved fuel economy
  • Eliminate dry starts
  • Minimize engine overheating
  • Get more miles per gallon of fuel
  • Affordable price for large bottle
Cons
  • Doesn’t work well in cold weather

5AI Innovations LUC10002 Lucas Heavy Duty Oil Stabilizer

Why we like it: An excellent formula that suits nearly all types of engines. Great for reducing friction, noise, and corrosion.

Editor’s Rating: 

This oil additive is marketed towards all 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 starting on this oil additive.

The oil additive can be mixed with both engine and transmission oil. AR9100 works with any mineral synthetic oil.

Formula
Arcoil AR9100 contains a substance called Nanoborate. It is an ester and a mild detergent that disperses contaminants in the engine.

Biggest perk:
The cleansing capabilities of the formula will dislodge any level of carbon deposits or sludge in engines.

The oil additive can be used during a regular oil change. It can be added to the engine, hydraulic, or power steering oil.

Performance

This engine oil delivers advantages in many ways. It’s wonderful at reducing both friction and friction heat.

We noticed a significant noise reduction in engine performance as well. Using this additive will reduce the wear on engine components and extend life.

Plus:
It can protect the engine in cold weather. The oil additive does protect the engine against dry starts.

You will be able to experience enhanced fuel economy and more power. The vehicle would also produce less heat.

This oil additive has better sealing capabilities than most. Therefore, the blowby caused by piston rings is very minimal.

An interesting advantage:
Anti-corrosion capability. This oil additive will relieve engine pressure and protect against agents that cause corrosion.

This is really good for injectors of 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 engines. It’s important to check your vehicle manual before using this additive.

Overall
This is a great oil additive that would not only reduce engine oil deposits but also eliminate corrosion. You can enjoy a much quieter and smoother ride with this oil additive.

Pros
  • Reduces engine deposits
  • Minimizes noise
  • Eliminates dry starts
  • Gets rid of blowback
  • Works with both gas and diesel engines
Cons
  • May not work with all vehicle models

6Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment

Why we like it: A great formula that can be used in fuel or in oil. Works exactly as advertised.

Editor’s Rating: 

Marvel oil additive can be used in all types of engines. Yes, that includes hybrids and GDI.

This oil additive can be used in fuel or in oil. It works with conventional, synthetic, and 2 or 4 cycle engine oils.

Fuel types this oil additive works with:
Diesel, gas ethanol, and biodiesel blends.

Formula
Arcoil AR9100 contains a substance called Nanoborate. It is an ester and a mild detergent that disperses contaminants in the engine.

Biggest perk:
The cleansing capabilities of the formula will dislodge any level of carbon deposits or sludge in engines.

The oil additive can be used during a regular oil change. It can be added to the engine, hydraulic, or power steering oil.

Performance

We liked this oil additive mainly because the results were tangible. We could immediately feel a boost in power and performance after using this oil additive.

It removes contaminants and other deposits from both fuel and engine parts. Most oil additives work only with fuel.

Fun fact:
The Marvel oil additive can eliminate nearly 99 percent more deposits than other types of gasoline additives.

You can expect excellent fuel economy when using this product. It will eliminate blowby, dry starting, and similar issues.

It’s great to use when maintaining vehicle as a preventative method. This additive does fully accommodate the demands of modern vehicle engines.

If you still use a vehicle with an exhaust tube, expect this additive to eliminate exhaust smoke.

It’s that good at reducing emissions by keeping the engine in optimal shape.

The only downside is that the price can feel a bit compared to similar products. But it’s not too expensive.

Overall
If you have a modern engine with an advanced system, we highly recommend using this oil additive. It works perfectly with any type of new engine.

We were satisfied with how effectively this oil eliminated deposits. It was 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.

Pros
  • Works with new engine types
  • Prevents rusting or corrosion
  • Reduces exhaust smoke
Cons
  • Price on the expensive side
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7Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment

Why we like it: This is a striction reduction oil additive that can be used with diesel and gas engines. It can release stuck parts without using dangerous chemicals.

Editor’s Rating: 

REV X oil additives are sold as the “original striction fix.” It’s not an exaggeration. It works with any diesel or gas engine.

This oil additive enhances the performance of lubricating fluid in vehicles. It doesn’t introduce new chemicals into the engine.

This oil additive is best used for the ultimate friction reduction in most types of vehicles.

Formula

This oil additive is made to work with other lubricating oils in the engine. You can expect this product to be free of contaminants such as zinc.

The RevX oil additives work on something called striction in your vehicle. It occurs when the engine parts rub against each other, causing friction and possible fires.

In fact, this oil additive can be used to fix striction issues in turbochargers and HEUI injectors. It can release stuck engines without needing harmful chemical strippers.

Major advantage:
Using this oil additive will not harm engines because it doesn’t contain any harsh chemicals.

Performance

The perks of using this oil additive are many. For starters, it will increase the horsepower of the engine.

You can expect greatly improved efficiency levels. This additive can reduce the operating temperature of the engine to increase performance.

What’s more?
This additive works on the lubricating products of the engine. It’s like a catalyst that makes the lubes act better.

You can use this oil additive with any type of lubricant fluid. It works with gear and hydraulic lubricants, plus high-grade lubes.

Interesting fact:
This oil additive is safe to use with exotic or soft metals. Besides, it’s completely free of graphites, moly, Teflon, or any other chemical.

We noticed that this fuel additive greatly improves vehicle starting in cold weather.
The only negative we see is the price. This oil additive is one of the most expensive on the market.

Overall

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

Pros
  • No harmful chemicals
  • Enhances lube power
  • Safe on metals
  • Reduces striction
  • Improves fuel economy
Cons
  • Quite expensive

8Genuine Ford Fluid XL-3 Friction Modifier Additive

Why we like it: OEM oil additive that will never go wrong. Can be used with non-Ford 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.

Formula

This formula is quite impressive, and not just because this is an OEM product. The oil additive is made for use with limited-slip differentials.

The additive oil can immediately reduce chatter in the hypoid gears. The main function of the oil additive is engine noise reduction.

Each bottle of the oil additive has a tapered neck applicator. Therefore, using this oil additive is extremely easy.

The formula works on the lubricated parts of the engine. It reduces surface friction without a doubt.

Performance

There’s no better oil additive for Ford vehicles than this. We were surprised by how well this additive reduced the engine noise levels.

The slip differential chatter will the all but eliminated when you use this oil additive. The before and after usage results are as different as night and day.

It’s easy to handle as well. However, beware of this fact:
This oil additive is extremely noxious. It smells rather bad so using a face mask is highly recommended when handling this substance.

Though we were somewhat disappointed in how it didn’t reduce deposit and rust. Be mindful of the intended use of this formula when buying.

Another downside:
This oil additive can be hard to find. Unless you call up a Ford warehouse, you will have to go out on a limb to find this motor oil additive.

Overall

This oil additive is a rare OEM product. It delivers results in reducing noise and friction easily.

Pros
  • Reduces engine noise
  • OEM brand product
  • Eliminate most friction in engine parts
  • Tapered neck applicator
Cons
  • Hard to find
  • Doesn’t dislodge engine sludge

9Bg MOA Part # 110 Engine Oil Supplement

Why we like it: 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 renewed easily. It works with both synthetic and natural oils.

The manufacturer doesn’t provide exact specifications for the oil. So don’ start using without checking vehicle compatibility.

Formula

This oil additive comes from an aftermarket supplier. Still, it works like a charm.

The formula is made to work on overheated engines. This is a protective additive that will safeguard engines against an increase in temperatures.

This additive protects engines against oxidization. It’s something that happens with the stop-and-go type of driving.

In addition to preventing engine oil liquidation, this oil additive can prevent thickening of engine oil on the long term.

You can use this oil additive to make driving smoother even in hard environments and conditions. That means driving in hot temperatures.

What about winter?
You can expect decent results in hot climates. It works in normally cold temperatures but don’t expect smooth performance in extremely cold environments.

Performance

We were really impressed by how well this aftermarket oil additive worked. It is, in fact, recommended by auto mechanics.

It should be understood right away that this oil additive doesn’t fix all engine problems. It only offers relief when the engine is struggling.

We recommend using this for relief in friction conditions. It’s great to use to prevent engine wear and tear that occurs with age.

In fact, start using it when the 1,000-mile mark is hit on the mileage meter. You can start maintaining your vehicle then.

Keep in mind:
This reduces friction and dislodges sludge. Don’t expect protection against rust and similar issues.
It’s marketed as working with both synthetic and non-synth oil. However, we found that this works slightly better with non-synthetic oils.

Overall

Bg MOA is a highly affordable oil additive that works as promoted. Don’t expect anything fancy.
It will keep the engine running smoothly and protect against high-temperature conditions. It’s a decent engine protector.

Pros
  • Affordable price
  • Protection in high temperatures
  • Reduces friction
  • Great for many types of engines
Cons
  • Only basic protection is offered

10XL Nanolube Engine Oil Additive & Nano Treatment

Why we like it: Great aftermarket brand for hotter months.

Editor’s Rating: 

This relatively new aftermarket brand is made to work in both gas and diesel engines. It mixes with all grades of engine oil.

There were many reasons why we liked this oil additive. It’s not too expensive and offers several interesting perks.

Formula

This oil additive is marketed as a “super nano lubricant.” According to the manufacturer, it can “detox” the engine.

Marketing language aside, this is an excellent oil additive to prevent high temperatures burning inside the engine. High heat exposure can accelerate sludge buildup.

This oil additive prevents that. It will get rid of sludge, gum, and varnish inside engines.

This formula can prevent contaminants that occur between the combustion chamber and piston chamber in engines.

Recommendations:
This oil additive is recommended for engines over 6 years old, or have marked over 75,000 miles. It works with newer engines as well.

Performance

The performance in our opinion was impeccable. This oil additive stabilized the engine and prevented contamination on many levels.

The results:
Reduced emissions. No more nasty exhaust when you start using this oil additive.

The formula actually sticks to metal surfaces of engines. It doesn’t drip off!

That means you won’t experience any dry starts. There are many other perks as well.

Start using this oil additive to make older engines faster and smarter. It can be used in newer engines as well, but the results won’t be as impressive.

We found this to be on the superior end when it comes to handling the heat. It’s great to use in the summer.

It works with all types of engines too, including aluminum, as seen in certain range Rovers.
Unfortunately, it doesn’t prevent rust issues.

Overall

We’d say we definitely got our money’s worth with this oil additive. It’s new to the market, but the quality is easy to count on.

Pros
  • Works well in high-heat conditions
  • Works with many types of engines
  • Removes deposits
  • Great for “detoxing” the vehicle
Cons
  • No rust protection

Best Oil Additives Buyer’s Guide

Oil additives are largely a yay for some and a nay for the others. Whether you are pro or anti-additives, you should first know the basics of buying an oil additive.

To make sure you are making the right purchase, refer to the brief guide below:

Understand the Types of Oil Additives
There are different types of oil additives, naturally. You might want to know what each is before choosing the best product for your vehicle.

Here are the main types of engine oil treatment you should know about:

Complete Engine Treatment
This type of oil additive prevents friction. It forms a protective barrier around engine parts to eliminate excess heat.

Engine Break-In Oil Additive
Used with engine oil mostly, this additive protects camshaft lifters in the vehicle. It can also lubricate the valve train.

Engine Oil Stop Leak
This mainly stops leaks in engines by sealing the part that’s causing the leak.

Heavy Duty Oil Stabilizer
This type of 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.

It would be up to you to decide which type of oil additive you want.

Learn about the Chemicals in the Additive
This may seem impossible at first, but try to learn about the compounds they put in the additive. Here is a list:

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

Phosphorous
This chemical limits metal-to-metal friction in engines. It prolongs the life of the engine.

You can buy zinc and phosphorous blends now if that’s what you want.

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’s an alternative called PEA certification that indicates the same eco-friendliness. If you want to make a smart environmentally-friendly purchase, refer to the EPA certification.

Engine Model

Usually, oil additives come with labels including what type of engines to use each with. It’s very important to understand compatibility with engines.

For example, some additives would work with only synthetic oil engines. Others will smaller engines, and so on.

Check your vehicles’ user’s manual to find out what type of engine it has. Then choose an oil additive based on it.

Do a Compatibility Check

Oil additives are often sold as suitable for gas engines, and so on. However, some types of additives may not be suited for certain vehicles at all.

The additive manufacturer isn’t the best party to decide whether the additive is good for the engine. Instead, refer to the vehicle’s user’s manual.

The user’s manual will indicate what type of oil additives you can buy. Specifically, the owner’s manual should list chemicals to avoid in oil additives.

Climate

Whether you are driving in winter or summer matters. Some oil additives can’t withstand the cold conditions of winter.

Nearly all oil additives are made to withstand high temperatures. Therefore, make sure the environment you drive your engine is suitable for the additive.