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Bar's Leaks Block Seal Head Gasket Fix

4.1 4.1 out of 5 stars 1,491 ratings

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Pack of 1

Purchase options and add-ons

  • Stops block leaks
  • Seals cracked cylinder heads and blocks
  • Repairs blown head gaskets
  • Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks.
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From the manufacturer

LEGENDARY PERFORMANCE FORMULAS Since 1921
1111 lifestyle photo

Blown Head Gasket?

When you think about a blown head gasket, do you see your money being spent at the repair shop? How much time and inconvenience is involved in taking your car to a mechanic for blown head gasket repair? Fixing a head gasket can cost you quite a bit (typically up to three thousand dollars). We know you would rather spend that money on the things that matter most. That’s why we created professional-grade, easy-to-use head gasket solutions.

  • Can your vehicle idle for 15 minutes without severely overheating?
  • How much work do you want to do?
  • What's your budget?

head gasket Head gasket fix HG-1 Head Seal Blown Head Gasket Repair
Bar's Leaks Head Gasket Repair Bar's Leaks Head Gasket Fix Bar's Leak Head Seal Blown Head Gasket Repair
Customer Reviews
4.2 out of 5 stars
545
4.1 out of 5 stars
1,491
4.1 out of 5 stars
3,901
Strong Stronger Strongest
How long before vehicle overheats? 15 minutes 20 minutes 15 minutes
Antifreeze compatible? No Yes Yes
Flush required? Yes (2) No No
Total install/down time. Up to 24 hours 15 minutes 45 minutes
Bar's Leaks logo

Made in the USA

Each individual Bar’s Leaks product is formulated and manufactured right here in the U.S.A. We’re committed to creating fast and affordable products that fit perfectly into your lifestyle and budget. Choose Bar’s Leaks, so you can discover just how simple automotive maintenance can be when you have the right tools.

Bar’s Leaks. Stop Leaks. Not Life.

Bar’s Leaks is more than just a stop-leak company

We are a team of enthusiasts and experts who create memorable experiences with each and every one of our customers. With over 75 years of experience in helping everyday automobile owners repair leaks, we have the track record of success and long history that demonstrates our commitment and passion to helping drivers of all experience levels. You’ll see that our passion shines through in everything we do.

Product Description

If the words “blown head gasket” make you nervous, we’re right there with you. We know firsthand that fixing a blown head gasket requires a hefty chunk of change and a few days without your car. Who has time to spend taking their car to the shop for a blown head gasket? And who has the extra cash to pay for a blown head gasket without planning for it? No, visiting the shop for a blown head gasket fix isn’t ideal. But what if we told you it was possible to fix this yourself with one of the most reliable blown head gasket solutions on the planet? Our easy-to-use Bar’s Leaks Head Gasket Fix will not only save you all that cash, but also get you back on the road in less than an hour. At Bar’s Leaks, we specialize in creating chemical repair solutions that are fast, easy, effective and affordable. Rather than spending hundreds or thousands of dollars at the repair shop, you spend just a few dollars and all without any of the inconvenience. This product contains a combination of antifreeze-compatible sodium silicate sealing liquid and various gasket-sealing particles that penetrate gaps and cracks and harden to permanently stop leaks. It’s liquid technology for damaged, leaking or blown head gaskets, and with over two million bottles sold, you can count on it to perform. We have a team of top-flight chemical engineers who are always innovating and pursuing ways to improve our existing products. As auto manufacturers introduce new technologies, we offer new products that will help everyday drivers save time and money through fast and effective solutions. Using our head gasket repair liquid is easy. Simply follow along with Bobby and Caitlin in our how-to video to safely and quickly get your car back on the road. There’s no reason a blown head gasket should sideline your life.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Bar's Leaks Block Seal Head Gasket Fix


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What's in the box

  • Unit^Instruction Guide
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.1 out of 5 stars
    4.1 out of 5
    1,491 global ratings

    Customers say

    Customers like the value and ease of use of the gasket. For example, they say it works great and is well worth the price. That said, some complain about the quality. Opinions are mixed on performance, leaking, heating, and white smoke.

    AI-generated from the text of customer reviews

    20 customers mention17 positive3 negative

    Customers like the value of the gasket. They say it works well, is worth the price, and will save them money.

    "...I am very pleased to say it works and is well worth the price...." Read more

    "...It did last for about a month!! Very simple to use and only a few dollars, worth it! Especially if you have to get yourself out of a jamb...." Read more

    "...However if you're looking for a cheap, quick, easy fix (especially for something that isn't your daily driver) - I would recommend this product." Read more

    "...Love this product! It saved me hundreds of dollars. It actually worked great for my situation" Read more

    13 customers mention13 positive0 negative

    Customers find the gaskets easy to use and simple. They also say it's a quick, cheap fix that seems to work.

    "Simple to use just poured it in the radiator and the engine quit using coolant." Read more

    "...UPDATE: didn’t hold permanently. It did last for about a month!! Very simple to use and only a few dollars, worth it!..." Read more

    "...However if you're looking for a cheap, quick, easy fix (especially for something that isn't your daily driver) - I would recommend this product." Read more

    "...Pretty straight forward, and easy to do. What do you know?..." Read more

    8 customers mention8 positive0 negative

    Customers are satisfied with the reliability of the gasket. Some mention that it holds up perfectly, has good quality, and has held up well after 3 months. Some say that the car is in great shape but not worth a $2500 head gasket

    "...But this one has almost a week on it and holding strong with no worries. I’ll try to make an update to this Review and give my most honest..." Read more

    "...3 months later, it has held up perfectly. i was adding coolant about every 100-200 mile, and now i add none...." Read more

    "...No more loss of coolant! That was 2 months ago and it's going strong." Read more

    "...fix, the gasket or crack is still there, this just buys time, and reliability. Most applications last over a year. very very good stuff" Read more

    122 customers mention72 positive50 negative

    Customers are mixed about the performance of the gasket. Some mention it works great, while others say that it didn't work more than a week, overheated, and stopped working at idle.

    "...I am now on day 16 and everything is still going great! No issues at all...." Read more

    "...Blue Devil, K&W, and K-Seal, they all overheated car and did not work more than a week. Had to remove thermostat and flush system with them all...." Read more

    "...Well a month later and about a 1,000 miles….no misfires, no check engine light, no white smoke and as crazy as it sounds the car has more power...." Read more

    "...It would not restart. Called the tow truck...." Read more

    69 customers mention25 positive44 negative

    Customers are mixed about the leaking of the gasket. Some mention that it stopped the leak, while others say that it didn't hold up on long, hard drives.

    "...First off my vans "symptoms" were massive coolant leak (over a gallon a day), over heating, oil mixing with coolant, heat only blowing out..." Read more

    "...Engine had been losing coolant slowly at first then faster. Saw no leaks and no white smoke...." Read more

    "...It seems that the Bar's Leaks won't hold up on long, hard drives...." Read more

    "...Amazing! It seems to stop the leak no more coolant loss! I will check back in 4 weeks to see how much coolant i have to add to top off by then...." Read more

    60 customers mention25 positive35 negative

    Customers are mixed about the heating of the gasket. Some mention that it helps stop overheating and the car runs smoother. However, others say that the temperature also increases when idling and the cold coolant level continues to decrease.

    "..."symptoms" were massive coolant leak (over a gallon a day), over heating, oil mixing with coolant, heat only blowing out cold air...." Read more

    "...IT WORKED! Combustion back, no coolant loss, and a daily driver for a year before getting rid of the car. Recommended!!!" Read more

    "...Then the clear sign of a blown head gasket of white smoke and low antifreeze show up...." Read more

    "...I didnt see any oil foaming or lose of coolant. My truck never overheated. So i did a little bit of googling and found this product...." Read more

    21 customers mention10 positive11 negative

    Customers are mixed about the white smoke. Some mention that the gasket works, and there's no more excessive smoke from the truck. However, others say that the next day there was still white smoke or the exhaust.

    "...later and about a 1,000 miles….no misfires, no check engine light, no white smoke and as crazy as it sounds the car has more power...." Read more

    "...Then I notice the smoke in the exhaust...." Read more

    "...IT WORKED! Combustion back, no coolant loss, and a daily driver for a year before getting rid of the car. Recommended!!!" Read more

    "...Product works. Head gasket blew and car was smoking pretty bad. Took it to mechanic and he said not worth doing engine...." Read more

    32 customers mention8 positive24 negative

    Customers are dissatisfied with the quality of the gasket. They mention that it's not a permanent repair, and it screws up the radiator.

    "...Did not go over 30 mph. About 1/2 mile away the engine shut down so I pulled into a driveway. It would not restart. Called the tow truck...." Read more

    "...Mechanic said I have a blown head-gasket and one cylinder is misfiring as coolant is leaking into the chamber...." Read more

    "...Great Stuff and great service, will order again and again from this sellor." Read more

    "...as the bottle and labels can be improved and there is gunk at the bottom of the coolant tank. How do you get rid of that?..." Read more

    Five Stars
    5 Stars
    Five Stars
    Didn't think it would work, was going to put the car away for awhlie, so I thought I would give this a shot, only used 1/4 what they said I could. Car was smoking white on idle only, and had the milky stuff under the oil cap. I got my car warm first with the cap off and pour it in..drove for about 15 mins..car already stopped smoking and was running better..been 3 weeks and everything still looks good..if it don't hold I'm not pouring more in, just going fix it..Well it's been almost a month now..car still doing good..was getting some crap around the radiator cap..so I flushed the system out about a week ago..I still can't believe this stuff worked..my head gasket was just starting to go, so I don't know if will work for everyone, but I'm very satisfied. .
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    Top reviews from the United States

    Reviewed in the United States on September 27, 2017
    Size: Pack of 1Verified Purchase
    24 people found this helpful
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    Reviewed in the United States on April 29, 2023
    Size: Pack of 1Verified Purchase
    18 people found this helpful
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    Reviewed in the United States on November 18, 2012
    Size: Pack of 1Verified Purchase
    65 people found this helpful
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    Top reviews from other countries

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    MSC
    5.0 out of 5 stars Worked well.
    Reviewed in Canada on February 4, 2024
    Size: Pack of 1Verified Purchase
    Cesar Axel Mendoza Sanchez
    5.0 out of 5 stars Funciona muy bien.
    Reviewed in Mexico on October 27, 2023
    Size: Pack of 1Verified Purchase
    Wenceslao C.
    5.0 out of 5 stars Excelente
    Reviewed in Mexico on September 27, 2023
    Size: Pack of 1Verified Purchase
    Phil Poulos
    5.0 out of 5 stars 2003 Subaru Impreza head gasket coolant leak
    Reviewed in Canada on January 18, 2023
    Size: Pack of 1Verified Purchase
    One person found this helpful
    Report
    Astrid Ortiz
    4.0 out of 5 stars Bueno
    Reviewed in Mexico on November 6, 2022
    Size: Pack of 1Verified Purchase