Ratings & Reviews for Bar’s Leaks BAR'S LEAKS Cooling System Radiator Stop Leak Multi-Purpose 11 oz 4 Pack
Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers overwhelmingly praise this radiator leak sealant for delivering fast, reliable results on small to moderate coolant leaks. Most report dramatic improvements—leaks stopping within 25 miles of driving, coolant no longer dripping, and odors disappearing within days. Many describe it as a lifesaving emergency fix that kept them on the road and avoided costly replacements. Reviewers consistently note sustained effectiveness over months, with some reporting sealed leaks lasting 4 to 9 months. Users appreciate its ease of use requiring no mechanical expertise and no system clogging. A few mention it's not a permanent solution, but the overwhelming consensus is that it works as advertised and delivers exceptional value.
Customer review summary generated by AI, including incentivized reviews.Worked Great!
I had a persistent coolant leak, even after replacing all the parts, there was a minute leak which I couldn't figure out for years now. I used Bar's Leaks Liquid aluminum and it fixed the issue immediately. What was amazing Is that I only used about a third of the bottle and it worked right away. I would certainly use this again and highly recommend it to anyone having the same issues.
From Rislone
awsome performance
Would Recommendi drive cross country had a leaking head gasket on my cat engine just to make a 700 mile trip back home to my shop after only 100 miles stopped and checked things and stopped the leak
From Rislone
Good Stuff
Would RecommendI bought this a few months ago, and it helped! Thank you
From Rislone
Great product
Would RecommendIm bought This product for a bad leak on my radiator and freeze plugs and it completely works even after 2 heat ups on the same week
From Rislone
Great product
Would Recommend[This review was collected as part of a promotion.] Poured it in couple days ago and no leak yet! Hopefully stays good.
From Rislone
Seals Leaks Fast
Would Recommend[This review was collected as part of a promotion.] Been working in the Auto Parts industry for over three years. Customers constantly come in looking for an additive to stop coolant leaks and I’m always confident in recommending Bars products.
From Rislone
Great stop leak
Would Recommend[This review was collected as part of a promotion.] Worked great and stop a small leak on the radiator
From Rislone
Works great!
Would RecommendMy radiator had been leaking for a bit and I finally got into our local auto parts store to get something to help. A friend told me about Bars Leaks radiator stop leak, said that it had worked for them. So when I saw it on the shelf, it was the one I grabbed. Man I'm sure glad i did. It's been about a month now and I haven't had any more issues with it leaking. Thank you so much for a great product!
From Rislone
great stuff
Would Recommend[This review was collected as part of a promotion.] I had a small leak at the bottom of my radiator and put this product in there and within 10 minutes it stopped leaking
From Rislone
leaky radiator
Would RecommendMy mechanic told me to get, Bar's stop leak for radiators. He saved me getting a new radiator.. Worked like a dream, I can't afford to repair it right now! So with stop leak, I don't have to.
From Rislone
Works Amazing In A Pinch
Would Recommend[This review was collected as part of a promotion.] I used this on a leaking hole in my radiator and it stopped it leaking within 10 minutes of application.
From Rislone
Leak no more!!
Would RecommendI bought this after finding coolant leaking under my car I followed directions and it worked perfectly as described
From Rislone
Have used this product for decades.
[This review was collected as part of a promotion.] There are thousands of "mechanic in a can" products available. Only a handful of them are at all effective. Bar's Leaks Radiator Stop Leak works every time I have used it. I have found it to be a lifesaver when out on the road and the radiator or heater core develops a leak.
From Rislone
Great product
Would Recommend[This review was collected as part of a promotion.] Had a leaking heater core and I used this product and it was an immediate fix!!!
From Rislone
A Product That Works
Would Recommend[This review was collected as part of a promotion.] I have used this product in everything from an AustinHealy Spite to many Ford and GM products It is a permanent solution to a nagging seepage issue. It has been on the market for a long time because it simply works each and every time.
From Rislone
Stuff works great
Would RecommendWorked as advertised! This concentrate actually works and seals leaks, but it could take more than a single bottle. I always travel with a full bottle of this in my truck. Follow the bottle instructions and you will be good to go.
From Rislone
IT ACTUALLY WORKS!
Would Recommend[This review was collected as part of a promotion.] My dad taught me 60 years ago that BarsLeaks was a necessity for cooling systems and that some car manufacturers actually put it in new cars at the factory. Ever since, I have always included it in every coolant system flush and fill, leaks or not. Recently my 1986 Corvette had a small coolant leak that I couldn't find. I put in bars leaks and NO MORE LEAK! It is great stuff!
From Rislone
First Try --- Great Start
Would RecommendI just tried one of the products and it worked good, saved me money, and gives me a sigh of relief. Thank you. Please keep on making more products to help us.
From Rislone
Works great
Would RecommendWas out of town and had an small leak on the side of my radiator stopped and bought the radiator stop leak worked great would recommend
From Rislone
Works great
Would Recommend[This review was collected as part of a promotion.] No issues since using . It totally sealed. Thank goodness. Michele
From Rislone