Best Engine Oil Stop Leak Additives Review

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If you are anything like us, then your car is your livelihood. It’s how we get to and from work each morning, and how we travel anywhere in our lives!

This is why it can be such an issue if your vehicle has a problem.

The last thing you want or need is to have your car in the body shop, whilst you’re waiting for repairs...and the bill.

Whether you have a brand spanking new car, or an older much more vintage vehicle, they will both have at least one thing in common. As the engine ages, the more likely it will leak.

Despite how small a leak is, the repercussions can cause serious damage, and a lot of repairs to the vehicle. But, there’s another way.

By adding a stop leak additive to your engine, you can stop those little leaks in their tracks, and you will not have to pay for expensive repairs to your vehicle. 

This is why we have created a list of the best stop leak additives on the market, so that you, and your engine are covered! 

Our Best Stop Leak Additive 

Our top pick is by far the Lucas Oil Engine Stop Leak. This stop leak additive is one of the most popularly used around, and it is no wonder why.

Lucas products truly are top tier when it comes to fixing up your vehicle with system additives, and this product is used by many professionals. 

This not only works to seal leaks, but the Lucas Oil Engine Stop Leak additive actually also works to improve performance, which is more than many other competitors can do.

In addition, it is highly compatible with petroleum, semi-synthetic and full synthetic motor oils for your convenience, whilst also cutting down on engine noise!

If you are looking for an affordable, impressive stop leak additive, then the Lucas Oil Engine Stop Leak is the one for you.  

5 Best Engine Oil Stop Leak Additives

We know how important it is to fix up your vehicle as soon as there is an issue. You cannot go too long without a car, and you are going to want to get it back on the road as soon as possible.

Luckily, we have done the research for you, and found five of the best engine oil stop leak additives for you to choose from.


Lucas Oil 10278 Engine Oil Stop Leak, 1 Quart

If you ask any auto parts store or body shop, and ask them for an engine stop leak product, you're probably going to be pointed in the direction of the Lucas Oil Engine Stop Leak additive.

This product truly is the holy grail when it comes to preventing leaks in your vehicle’s system. 

This engine stop leak additive is so popular because of its impressive results when it comes to stopping leaks, but also because it actually improves the overall performance of your engine at the same time! 

In addition, this stop leak from Lucas does not work to dilute your engine oil, like other competitor products, and therefore it works to increase the oil pressure, and provides you with better performance as a result! 

What is even better about this product is that there are no harmful solvents or ingredients, which means that they are practically compatible with every gasoline engine, however the Lucas Engine Oil Stop Leak is not compatible with diesel engines. 

Additionally, one of the most likeable features of this product is its price point.

This engine oil stop leak is highly affordable when compared to competitor products, and will not break the bank.

This makes it a great alternative for fixing the issue yourself, rather than taking your vehicle in for repairs. 

For all of these reasons, such as high compatibility, increased performance and affordability, the Lucas Engine Oil Stop Leak is at the top of our list. 


  • Highly affordable product
  • Simple to apply
  • Reduces engine noise
  • Increases performance
  • Impressively seals leaks


  • Will not work well on more severe leaks
  • Is not compatible with diesel engine vehicles


BlueDevil Oil Stop Leak

Blue Devil is a popular manufacturer of car products and accessories.

With a wide range of vehicle additives to choose from, it’s no wonder that this engine oil stop leak made it on our list! 

The Blue Devil Oil Stop Leak is the perfect solution if there is a leak in your vehicle engine, and is one of the most favored additives available on the market!

This is widely down to the fact that many other engine stop leak products typically contain certain chemicals known as petroleum distillates, however, Blue Devil do not use this in their products. 

These types of chemicals can be harmful to your vehicle’s system, and so, picking an Engine Oil Stop Leak that does not use them will keep your car in the best condition, as these problems can be even more expensive to fix than the initial leak! 

Another great benefit of this engine oil stop leak additive is that it is suitable for both gasoline and diesel engines.

However, you should not use it if you are using synthetic oil in your engine. 


  • Provides long lasting results
  • Works in diesel engines and gasoline engines
  • Does not contain harmful chemicals
  • A safe product for people and the environment


  • Cannot be used in conjunction with synthetic oils
  • Will not seal leaking head gaskets very well


ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

If you have found an oil leak, and you want to solve the issue quickly before it becomes an even bigger problem, you will want a fast acting solution.

ATP engine oil stop leak is one of the fastest acting products available in this case. 

Whilst it is an incredibly versatile product, ATP Engine Oil Stop Leak also works really quickly!

What is even better is that this product works in most vehicle’s major systems, and can help fix issues in the transmission, power steering, hydraulic systems and the front and rear differentials. 

In addition, this engine oil stop leak also works in diesel vehicles, which means that this ATP product is suitable for both gasoline and diesel cars. 

What we like about this product is that there are no harmful solvents that can damage the car, and can also be used to rejuvenate damaged gaskets and seals for quick and effective action for your vehicle. 

The only issue with this product is that it can dilute the oil in your vehicle, which will eventually reduce the overall performance of the car.

It is best used for fast results, and will solve the problem quickly- so that a leak does not worsen, and cause more damage. 


  • Provides very fast results
  • Works for multiple vehicle systems including diesel engines
  • Can be used with nearly all oil types
  • Has no harmful solvents


  • Can cause excessive exhaust smoking in some cases


NO LEAK 20401 Engine Oil Stop Leak, 16 Fl oz.

When your rubber seals start to deteriorate over long periods of use, an oil leak may develop.

The No Leak Engine Oil Stop Leak is a powerful solution for sealing and protecting those rubber seals, to prevent the leak from happening, or halting it as it starts. 

In addition, your vehicle may start to smoke excessively, which can cause a nasty smell, but No Leak Engine Oil Stop Leak will eliminate the smoke, and prevent this from happening again in the future. 

The good thing about this product is that it is very safe to use, and is compatible with all engine oils, which makes it very versatile.

In addition, it works quickly and efficiently to rectify the problem, and is therefore a product that you can rely on when it comes to your vehicle. 

Also, the No Leak Engine Oil Stop Leak can be utilized with any engine type too, so you know that this product is safe for use with your vehicle. 

An extra added bonus of using this product is that this can also prevent leaks on the rear main seal- which is a difficult place to fix, but not for the No Leak Engine Stop Leak!


  • Safe for use and compatible with all engine oils
  • Stops smoke and repairs rear main seals
  • Stops and prevents engine oil leaks and seals 


  • Will need some substantial mileage before stopping the leak


Bar's Leaks Rear Main Seal Repair, 16.9 oz

As previously stated, one of the hardest leaks to fix is the rear main seal. Rectifying this issue can be a bit of a pain, but also very expensive to fix.

Luckily, you can use Bar’s Leaks Rear Main Seal Repair to fix it up in no time! 

This formula is intended specifically for leaks in the rear main seal, however it does work wonders in other engine areas where there may be leaks, and so this is a product you will want to keep handy. 

In addition, it also works for both gasoline and diesel vehicles, and is completely 100% compatible with all oil types including synthetics.

This product is also fast acting, and cost efficient, so you can fix the leak yourself without the hefty body shop bill!


  • Can be used for fixing leaks in rear main seal and in other parts of the engine
  • Is fast acting
  • Compatible with all oil types and both diesel and gasoline engines


  • Works better with newer engines, and not as efficient in older vehicles

Whichever engine oil stop leak product you choose to purchase, you may want to consult our Buying Guide, so that you know exactly what you need, and which products will be best for your requirements.

Best Engine Oil Stop Leak Additives Buying Guide

With this buying guide, you can ensure that you have the perfect products for you and your vehicle.

In addition, we can help answer some of the more common questions regarding engine oil leaks, in order to make sure that you find the right solution for your problem!

What is an engine oil stop leak?

As your vehicle ages, the engine will start to deteriorate after much use. This general wear and tear will increase over time, and the inside of your car system may start to shrink. 

These components such as the gaskets, seals and O-rings can become damaged, or start to crack, leaving small openings in your vehicle’s system.

It is in these openings that oil may start to leak from the engine.

To prevent this, or stop this from happening, you will want to use an engine oil stop leak.

This will work to rejuvenate and repair the deteriorated rubber parts of the car, and return them to their former glory- stopping the leak in its tracks. 

Does an engine oil stop leak actually work?

You may have heard from some that engine oil leaks do not actually work. This may be the case with some products because they are only designed to work with specific engines, and specific oils. 

This is why it is best to purchase an engine oil stop leak that is compatible with various different types of engine oils, and both gasoline and diesel engines, so you have much more freedom and versatility. 

In addition, whilst these products are highly useful for fixing minor leaks in the engine, they are not made of magic dust, and cannot fix every problem.

Some types of oil leaks will require extensive repairing, and sometimes it can be better to leave it up to a professional. 

That being said, in most cases, minor and smaller leaks in your engine seal can be fixed with such a product because they are highly effective, and they work quickly to solve the problem. 

Which engine oil stop leak should you buy?

Some older types of engine oil stop leaks were developed with added ingredients that were intended to fill and clog up the gaps in a broken seal or gasket.

As such, these materials would often be sawdust, or metal shavings. However, these can be incredibly damaging for your vehicle, and can cause more problems with your car and engine over time. 

Therefore, nowadays, people tend to look for engine oil stop leak products without these fillers or any harmful additives.

These types of products will instead utilize absorbent fillers and help seal the gaskets and engine components.

However, there are still some of the older more harmful products available, so it is vital that you consult the description before purchasing. 

The main things to watch out for are petroleum distillates, as these can be a little rougher on the engine, and can be damaging after some extensive use.

You will benefit far more by purchasing an additive that uses plasticizers instead, as long as this is 100% compatible with your oil type and engine type. 

Things to consider when purchasing an engine oil stop leak additive

The most important things to consider when purchasing an engine oil stop leak is whether it will be compatible with your engine.

This means looking to see if the product works with either a gasoline engine or diesel engine, or in some cases, both. 

Diesel engines require a much thicker oil, so you will need an engine oil stop leak additive that can handle this, and is designed to work specifically with diesel engines for the best results! 

Additionally, some vehicle owners use synthetic oils in their engines, and so you should always strive to find an engine oil stop leak that will work with the specific oil in your engine, and buy the appropriate product for it. 

Another thing you need to consider is how protective the product will be once in use. Of course you will want a powerful product to cover the seal and the leak, but you will also want it to be fixed as well as it can be.

You will want to try products that only need a single application, and are fast acting for excellent yet efficient results. 

You will also want to think about what other benefits a product can have on your vehicle. For instance, will it prevent smoking, or help increase the performance of the vehicle.

In addition, you may want an engine oil stop leak that works in multiple areas of the engine so that you get the most out of your money.

Thankfully, we have provided a range of products for you to choose from, so you can find ones with exactly what you are looking for.


In conclusion, having your engine oil leak is not the end of the world, and you shouldn’t have to worry about spending loads of cash on fixing the problem.

Luckily, there is a whole host of engine oil stop leak additives to choose from, readily available on the market. 

Our personal favorite is the Lucas Engine Oil Stop Leak, as it is a trusted, reliable brand for an affordable price.

This product will not only stop the engine from leaking, but it will also prevent this from happening in the future, and will boost the vehicle’s performance overall. That sounds like a pretty good deal to us! 

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