6 Best Power Steering Stop Leak Reviews

Power steering leaks are very common. The worst part is that leaks occur right where they are more difficult to repair, and the only thing is you can use the best power steering stop leak.

Then again, hoses sometimes just blow out. They develop a leak at the point where they are crimped to an end fitting. The only way they develop a hole is if they run up against something in the engine compartment.

The first indication of a leak is the low fluid reservoir. You probably have a leak, if you find yourself filling the power steering fluid reservoir. You should hope that it is a power steering hose. This is so since the only other place a leak can occur is the steering rack.

According to the research I have conducted, including my own personal experience, I have found that the best way to stop power steering leaks is to use the best power steering stop leak additive.

If you can’t wait… jump to the desired product so you don’t waste your time:

  1. Lucas 10008 Power Steering Stop Leak
  2. BlueDevil Power Steering Stop Leak
  3. Prestone AS263-6PK Power Steering Fluid with Stop Leak
  4. Bar’s Leaks 1600 Power Steering Repair
  5. Gunk ower Steering Fluid with Stop Leak
  6. NO LEAK 20301 Power Steering Stop Leak

Causes of Power Steering Fluid Leak

Power Steering Fluid Leak Parts

You can only repair the power steering fluid leaks if you can do a proper diagnosis. Here are the major causes of power steering leaks.

Power Steering Pump

The power steering pump is one of the most likely places a leak would occur. It is normally due to a worn-out seal within the pump shaft. Also, excess pressure within the pump may inadvertently break the pump casing, causing a leak.

Hydro Boost Brakes

Most people would not think of the hydro-boost brake. However, this is another likely place where a power steering fluid leak may occur. In some automobiles, the power steering unit and the brake system are combined so sometimes it may be difficult to understand where the leak is located.

Power Steering Hoses

A power steering hose is one of the most popular places where a leak would occur. When checking a power steering hose, look for the signs of leakage or dampness at the connections.

Also, look for signs of deterioration, such as cracks, signs of rubbing, or swelling. A failed pressure hose can leak as well, blowing oil onto an exhaust manifold where it can cause even a fire.

Steering Gear Housing

Another place you can check is the power steering housing. The leak depends on the style of the power steering system.

Rack and Pinion Leaks

Rack and Pinion Leaks

A majority of modern-day cars are fitted with a power rack and pinion steering. Rack and pinion steering are more prone to cause problems because its weight has been cut over the years. Earlier power rack assembly weighed as much as fifty-four pounds.

Some newer racks weigh as little as eight to ten pounds. Weight reductions of this magnitude have had an effect on the durability of the steering gears. Some of the lighter units have not been very durable, requiring replacement while the vehicle still has relatively low mileage.

A rack and pinion steering gear can have an external leak at the pinion shaft attached to the steering column or from the rubber bellows at either end of the rack. Rack failures can be due to a torsion bar bent from a hard impact or serious internal or external leaks.

Some rack and pinion steering box leaks are merely the results of a leaking hydraulic cylinder line. These lines, sealed with O-rings, join the cylinder at one end of the rack to the valve at the other end.

If the leak is coming from one of these lines, you should be able to spot it while your helper turns the steering wheel back and forth. You should be able to detect it if you can see the rack. It is usually buried behind the engine on some cars.

Most rack and pinion steering box leaks are, unfortunately, a symptom of a failed rack. In most cases, steering effort gets hard before leakage begins. This hard steering effort is most noticeable when the car is cold.

What is Power Steering Stop Leak?

A power steering stop leak is a viscous, thick fluid that works to revive the rubber closures, stop the irritating noises, as well as relax the power steering. This ensures that the power steering works smoothly.

The choice of stop leak products is enormous in today’s market, and not every automobile owner can make the best purchasing decision. That’s why I have pulled together a list of the 6 best power steering stop leak fluids for your review.

The composition of Power Steering Stop Leak Fluid

Any concentration indicated as a range is due to batch variation or to safeguard confidentiality. As far as most power steering stop leaks are concerned, the use of some ingredients may be harmful to your health and/or the environment.

Stop leak fluids are usually composed of the following:

  • Hi-Tech Additives
  • Viscosity Improvers
  • Detergents
  • Fluid Stabilizer
  • Lubrication Additives
  • Seal Conditioners

Is Power Steering Stop Leak Safe to Use?

You may commonly think of hazardous things as being likely to cause serious harm, but that is not the case. Many things that the OSHA Standard defines as hazardous can only cause slight harm or irritation, and with proper precautions, even that is very unlikely.

According to the OSHA Hazard Communication Standard, the manufacturers of power steering stop leak additives, importers, or distributors offer Material Safety Data Sheets or MSDSs for each harmful ingredient in order to pass the info on such hazards.

Therefore, you can determine whether or not a specific stop leak fluid is safe to use by checking the information provided on the MSDS. Such information may include safe handling precautions; environmental, health, and physical health hazards; and protective measures.

Generally, a safe to use power steering stop leak will have a safety data sheet that the materials used are not regarded as hazardous by Hazard Communication Standard OSHA. In most cases, such SDS will contain useful info necessary for proper use and safe handling.

How Power Steering Stop Leak Works?

Power steering systems leak and when they do they become a bother since they can render your car useless unless they are repaired. The best way to stop this problem is by using the best-rated power steering stop leak.

Depending on the quality of the fluid, a stop leak fluid may stop a leak or just slow down a leak. Usually, leak-proof rubber seals sit in your engine for a long time. Over time the seals become dry, crack and finally leak the power steering. A stop leak fluid simply closes the crack to stop the leak.

Apart from the above, a stop leak fluid will do the following apart from stopping or preventing a leak:

  • Revitalizes neoprene and rubber O-rings and seals
  • Quieten and smooth power steering action
  • Uses dispersants and detergents to clean as well as protect the system
  • Prevents oxidation and ageing of power steering oil
  • Reduces noise made by a low fluid condition
  • Extends component life

How Much Power Steering Stop Leak to Use?

In most cases, a single power steering stop leak bottle can be used for up to 3 quarts of fluid. Usually, a single treatment may be enough. However, a second treatment may be required if the leak continues. If a leak continues after a second treatment, then you should consider seeing your service dealer.

Top 6 Power Steering Stop Leaks Reviews

1. Lucas Power Steering Stop Leak

The Lucas Power Steering Stop Leak is a light tackiness fluid that is red in color and has a petroleum smell. It has a flash point of 223.889°C COC, a velocity of 45 at 100°C CST, density of 7.676 at 15.556°C LBS/US Gal, and a specific gravity of 0.9218 at 15.556°C.

This high performing oil stops seal leaks and gets rid of hard spots. It is a blend of petroleum extracted additives and special oils, and it does not have any solvents. This is a great preventative maintenance fluid for new units, since it doesn’t have long-term harmful effects.

If your power steering system is leaking, just add this amazing product until the leak is no more. You may probably need one to two bottles to successfully stop a leak. You would also have to suck some of the fluid from the reservoir and then refill to get rid of hard spots, whines, and squeals.

With a kinematic viscosity of 45 at 100°C CST, this stop leak is more viscous compared to regular fluids. I have used the Lucas power steering stop leak on my friend’s 2006 Honda Odyssey, and it worked wonders. The once loud power steering system became quieter.

The only downside that I have noted as far as this product is concerned is the fact that you will have to use two bottles to get the job done.

Can I use Lucas power steering stop leak in my brand new car?

Yes, you can. The company guarantees that its products do not void the warranty of a new car.

Are there any solvents in the Lucas power steering stop leak?

No, it contains a hundred percent petroleum-based additives.

Lucas 10008 Power Steering Stop Leak - 12 oz
  • Lucas, 12Oz, Power Steering Stop Leak, Removes Hard Spots And Stops Most Leaks Or Your Money Back! This Formula Is A Blend Of Special Oils And Petroleum Extracted Additives, Contains No Solvents And Is An Excellent Preventative Maintenance Product Of New Units
  • The unit is Complete Line Of Heavy-Duty Shop Product.
  • Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories
  • Totally effective in reducing slack, squeals, and hard spots in worn rack and pinions.
  • Guaranteed to stop seal leaks
  • Stops rack and pinion problems
  • Very cost effective

2. BlueDevil Power Steering Stop Leak

With the high pressure and constant motion associated with the power steering, it is not unusual to find leaks even with proper maintenance. BlueDevil Power Steering Stop Leak could be the perfect solution in this case.

If you notice a loss of power or have a leak in your system, the best way to fix your problem is to use the BlueDevil. This is a unique stop leak and conditioner. It works on both diesel and gasoline engines to restore shrunken, cracked, and dried rubber seals.

The BlueDevil does not contain particulate or solid matter in its composition. It will not harm or clog your car, SUV, van, or truck engine. It bonds very well to plastic, alloy, cast, or aluminum. It is also the ideal choice for marine engines, and automatic transmissions.

It will absorb effectively into the seals to revitalize, expand, and soften the size as well as the flexibility to the original condition. To get the best results, you should use one to the eight-ounce bottle to stop leaks up to eight-quart capacity.

This is definitely an excellent product for the money. It is regarded safe as well as easy to use. However, you will have to wait for a while before it can stop a leak in your car.

How does BlueDevil power steering stop leak work?

It absorbs into the system seal to expand, soften and revive the size as well as the flexibility of the seal’s original condition.

Must I change the power steering fluid applying BlueDevil?

No, the BlueDevil combines with the fluid.

Can I reapply the BlueDevil power steering stop leak?

Yes, you can repeat the treatment in case of future leaks, since the BlueDevil is petroleum distillates free.

BlueDevil 00232 Power Steering Stop Leak - 8 Ounce
  • Guaranteed Permanent Seal for Power Steering
  • Restores Dried, Cracked, and Shrunken Rubber Seals
  • Works to Stop Leaks in Gas or Diesel Engines

3. Prestone Power Steering Fluid with Stop Leak

The Prestone power steering fluid plus stop leak is an outstanding preventative and maintenance product that helps you avoid leaks.

It is a clear amber oil with a petroleum odor. It has a flashpoint of 124°C, a relative density of 0.88, a vapor density of>1, and a vapor pressure of < 0.1 mmHg @20°C.

It is made of high-grade oil and strengthened with additives that help to revive hardened, shrunken, and dried seals. It reduces or stops fluid loss due to leaky seals.

Unlike most traditional stop leaks, this product meets the service requirements of Chrysler, Ford, and GM among other global manufacturers. It contains a number of key elements that guarantee smooth system operation.

These essential elements include: pour point depressants, corrosion inhibitors, seal well agent, antioxidants, antifoam agent, and anti-wear agents.

Pour point depressants ensure your steering is good, even in low temperatures. Corrosion inhibitors protect all metal components from corrosion. Antifoam agents prevent steering loss and pump cavitation.

Seal swell agent protects as well as revives seals. Antioxidants ensure there is no formation of sludge. Anti-wear agents help to protect the components of the pump.

With this Prestone power steering fluid with a stop leak, your car will surely deliver superior performance. The small size bottle is also easy to stow away in your shop or garage.

This first-rate stop leak is available with a 12-ounce and 32-ounce handless bottle. Therefore, you will have to be careful when pouring to avoid the bottle slipping off your hand.

Can Prestone power steering fluid with stop leak work with a Mercedes Benz?

Yes, this is a universal fluid, but you should use a non-stop leak if the power steering system has no leak.

How long does it take to work?

There are no instant results. You would probably use two to three bottles for almost a year before the leak is completely gone.

Will Prestone power steering fluid with stop leak work on a leaky pump?

It worked on my pump, which had a slow leak. I filled around a third of the fluid since I had no means of draining the reservoir.

Will it mix with other power steering fluids?

Yes, it is well-suited to work with all approved power steering fluids to ensure power steering systems run smoothly.

Prestone AS263-6PK Power Steering Fluid with Stop Leak - 32 oz, (Pack of 6)
  • Keeps power-steering systems running smoothly and helps stop or reduce fluid loss caused by leaky seals
  • Formulated with high-quality oil and fortified with additives to revitalize dried, shrunken, and hardened seals
  • Developed for use in GM, Ford, Chrysler, and most foreign cars and light trucks
  • Anti-wear agents protect pump components
  • Corrosion inhibitors to protect metal components

4. Bar’s Power Steering Stop Leak Review

If you are looking for one of the trusted vehicle system stop leak and conditioners, then you should look no further than the Bar’s Power Steering Stop Leak. Bar’s Leak Stop is best equipped to bring your power steering leaking problems to an end.

It is designed to keep your vehicle’s seals soft and pliable, preventing dry-outs that lead to leaks and costly repairs. Bar’s Leaks Power Steering Stop Leak is safe and mixes with all factory-approved oils, fluids, and synthetics.

This product is specifically made to stop O-ring and seal leaks that are caused by aging and normal power steering wear. It works on pumps, gearboxes, pinion units, and racks. It is non-foaming, non-clogging, and non-corrosive.

This specific model is designed for a single bottle to be fitted in a light truck or passenger car. You should not overfill. A single bottle is capable of treating up to 3 quarts of power steering fluid. You should use one bottle for every three quarts of power steering fluid for larger systems.

How long does it take to start working?

It starts working the moment you install and start driving. The leakage would probably stop in approximately three days of driving.

If the first application does not entirely stop, may I add another bottle?

Yes, you can add a second treatment for hard-to-stop leaks. Mechanical attention may be necessary if the leak does not stop.

If I install more than the required amount, will it work faster or better?

No, this stop leaks are designed to work best at the suggested dosage amount.

Also, most modern vehicles have power steering systems that are equipped with inbuilt pressure relief, and most of them are situated in the cap. The heat will expand the stop leak fluid, and it will be forced to overflow out of the power steering system.

Bar's Leaks High Mileage Power Steering Repair, 16 oz.
  • Restores performance and smoothest out hard steering
  • Quiets squeal and noisy pumps
  • Stops leaks
  • Conditions seals
  • Prevents future leaks

5. No Leak 20301 Power Steering Stop Leak

The No Leak fluid will safely condition and soft rubber seals to stop leaks. It contains particles that seek out cracks and build up behind them to effectively gum them up and stop the leak.

Do not let a leaky vehicle drain your wallet when you have No Leak Power Steering Stop Leak. No Leak is formulated to seal power steering system leaks in a single treatment.

This stop leak comes in a sixteen-ounce bottle that is easy to pour. It is safe as well as compatible with all the transmission fluids.

However, it is not well-suited to work with central hydraulic systems. Therefore, it is wise for you to check your car’s manual to confirm your car does not have this type of system.

The fact that No Leak contains additives and petroleum oil means that it may be harmful to you. It may cause eye and skin irritation. You should remember to wash your hands properly after using the fluid.

Also, No Leak may contain some chemicals that are known to cause congenital disabilities and cancer, or other reproductive problems.

Is No Leak Power steering stop leak compatible with 2008 VW?

This stop leak works with all power steering systems apart from a central hydraulic system.

Is No Leak polymer or petroleum based?

The No Leak power steering stop leak is petroleum-based.

Can it work with ATF fluid?

It may work fine in your car, but the results are not guaranteed. You may see a drop or two before the leak is gone.

NO LEAK 20301 Power Steering Stop Leak, 16 Fl oz.
  • Stops AND prevents power steering leaks caused by dried, shrunken, or harden seals
  • Safe & compatible with ALL power steering fluids
  • Stops squeals and repairs o-rings and seals

6. Gunk Power Steering Fluid with Stop Leak

The Gunk Power Steering Fluid with Stop Leak is a high-performing, non-corrosive fluid that is very effective as a top off for non-synthetic power steering systems. It ensures that there are proper levels of power steering fluid.

It does a good job of preventing leaks by protecting hoses and seals. This fluid offers the best way to stop power steering leaks. It is equipped with anti-foaming agents that prevent frothing and detergent additives that ensure the system is clean.

The fluid’s advanced formulation provides exceptional fortification to the whole power steering system. This guarantees smooth performance under the harshest operating conditions. It protects against wear and oxidation.

I have used this one on my car, and it did hold up pretty well. There is only one downside I encountered as far as this product is concerned. The cap jammed and I could not open the bottle; so, I could not use the rest of the fluid.

You should also know that this fluid is fatal or harmful when swallowed. It is also combustible, vapor harmful, and irritant to the eyes and skin. Always remember to read the precautions on the back panel.

Can I add this to a vehicle that uses Dexron ATF?

I am not absolutely sure this stop leak will be safe for your car. So, you should directly call Gunk and inquire.

Can I replace this for my power steering fluid?

No, you cannot use it as a replacement, since it is an additive. You should consider using an actual power steering fluid.

Niteo Motor Medic M2714H/6 Power Steering Fluid with Stop Leak & Conditioner for Honda and Acura - 12 oz.
  • MOTOR MEDIC is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation.MOTOR MEDIC

Power Steering Stop Leak Comparisons

BlueDevil vs Lucas vs Bar’s power Steering Stop Leak

BlueDevil Power Steering Stop Leak vs. Lucas

Both BlueDevil and Lucas are designed to stop and prevent leaks in the power steering systems. However, the BlueDevil has a mild odor and the Lucas has a petroleum odor.

According to service data sheets of both oils, they are regarded safe to use, but you are advised to avoid contact with the skin and eyes as a precaution.

Technical InfoBlueDevilLucas
Density4.6 @ 20°C7.7@ 15.56°C
Viscosity, Kinematic @100°C CSTNo data available45
Flash Point (COC)91°C223.89°C
ColorColor may vary due to dyeLight red

I have used both power steering stop leaks with my car. I found the BlueDevil to be more effective than the Lucas. In fact, I had to use two bottles of Lucas (small ones) to get the job done.

Power Steering Stop Leak Lucas vs. Bar’s

Both are made to stop leaks in O-ring and seals caused by normal power steering aging and wear. They both work on pumps, gearboxes, rack, and pinion units.

The Lucas power steering stop leak is light red in color and the Bar’s power steering stop leak is amber in color. The Lucas has a petroleum odor while the Bar’s has a characteristic odor, but its odor threshold is not determined.

According to my personal experience, I found the Bar’s to be more effective than the Lucas. I managed to use a single Bar’s bottle, even though it took longer to seal the leak. I had to use two bottles (small ones) of the Lucas to get the leak to stop.

Frequently Asked Questions

Power Steering Stop Leak FAQ

Will the power steering stop leak help my noisy power steering pump?

One of the most common noises your car will make when it is broken is the power steering pump noise. There can be a number of hums, squeaks, or clunks that can point out a wide variety of problems.

If the leak appears at the pump and fluid reservoir, seals may be bad or the housing itself may have ruptured. You should not rush to replace the entire power steering rack. Instead, you should use a power steering stop leak to recover your old seals so as to stop the leak.

Can I drive my car with a leaking power steering system?

You can continue driving your car while there is a leak since there is nothing that is stopping you physically. However, when the level drops, there will be increased heat and friction that can rapidly lead to expensive damages.

Does Lucas power steering stop leak work?

Yes, it works and it is effective in reducing hard spots, squeals, and slack in the worn racks as well as pinions.

What is the best power steering stop leak to buy?

Basically, the effectiveness of the various power steering stop leaks differ. According to personal findings, I would highly recommend the Prestone power steering fluid with a stop leak.

How to differentiate the different types of leaks?

Green fluid indicates antifreeze and a cooling system problem, while reddish spots signal a leaking transmission. Power steering leaks have an amber color.


Finding a stop leak fluid that fits your vehicle is extremely important. Not only will you avoid potentially harming the power steering system, but it’ll also ensure that steering is smooth and hassle-free.

Keep in mind that these models are only my top choice, there might be others out there that can be suited your needs better.

So what power steering stop leak adhesive did you end up getting?

Last update on 2023-01-27 / Affiliate links / Images from Amazon Product Advertising API

Jack Harris

Jack Harris is a talented and advanced author, blogger, auto expert and senior technical consultant with Autosneed. He is a mechanical engineer who holds a Machine Lubricant Analyst (MLA) Level III certification and a Machine Lubrication Technician (MLT) Level II certification through the International Council for Machinery Lubrication (ICML) and ASE Certified. After years of working as both an automotive journalist and a Ford factory technician, to say I live and breathe the automotive world could still be considered an understatement.

11 thoughts on “6 Best Power Steering Stop Leak Reviews”

  1. Great article
    BUT when I try to print your article, the damn Amazon bar over rides the top of every page.
    Could you please fix this?


  3. Are there any risks of potential damage to a car if you use stop leak fluid? Also if there is a power steering rack leak, can putting in the stop leak fluid itself eventually leak out? Thanks.

  4. I put this in my 2005 Pilot and it made my power steering pump start howling. It didn’t stop until I drained and refilled my power steering with plain fluid.

  5. I’m very happy to find this website. I want to to thank you for ones time for this fantastic read!!

    I definitely really liked every part of it and i also have you book marked to check out new information in your blog.


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