Bar’s Leaks Head Gasket and Cooling Sealant repairs blown head and intake gasket leaks. Seals cracked cylinder heads and blocks. Stops heater core and radiator leaks. Fixes leaking freeze and core plugs.
- Repairs Blown Head And Intake Gasket Leaks
- Seals Cracked Cylinder Heads And Blocks
- Stops Heater Core And Radiator Leaks
- Fixes Leaking Freeze And Core Plugs






















Daisuke Takeoka –
UPDATE: No more than two weeks after writing the review below, I got a check engine light with a Cylinder 1 Misfire on the OBD. I cleared it, and a few days later it came back on. This pattern repeated for about two weeks, and it became clear that it was time to let my baby go. I think my 100 mile drive to San Diego and back was what put the final nail in the coffin.So in summery, yes, this stuff works temporarily, especially if your car hasn’t been overheating and you’re driving less than 30 miles at a time. It probably would hold indefinitely if you’re only commuting and not transporting a heavy load. It really is a finger-in-the-dike solution, and it won’t hold for long under stress. It got me through two months which was long enough for me to drive down memory lane and say goodbye to my old truck and replace her with her baby sister, just like that episode of the Wonder Years when Jack Arnold (the dad) has to replace the family car. I wasn’t disappointed by the outcome but took a star off my original score, just so my review is not any more misleading than it may have been.Is it worth buying? It was for me, but if you’re less sentimental and you’d rather tare the bandage off than peal it, I would go directly to replacing a high mileage car or the head gasket. Good luck!Please read on for the original review:ORIGINAL: Crossing my fingers as I write this, but it seems to have done the trick! I took my 2005 Tacoma into a local auto garage after the first time the Check Engine Light came on in late May. Mechanic said it was my thermostat, so he replaced the part, and I was on my way $400 later.Check engine light came back on June 20th, and by this time I had purchased an OBD II bluetooth scanner and Torque Pro for my Android device, as I felt powerless with my last experience. It showed a cylinder 1 misfire, and figured I needed new spark plugs so I went on Amazon to purchase new spark plugs, a spark plug wrench socket, anti cease compound and a torque wrench to do the repair myself (it was kinda fun!). I cleared the check engine light, and drove normal until July 6ish, when the check engine light came back on with the dreaded cylinder 1 misfire. From then on, I kept clearing the light and checking to see how long it took for it to come back on; it seemed to happen every 5 or so days and always when the engine was cold, and I was speeding up from 0 to 45 mph, as I live right off a busy street.Took the truck to the dealership on August 1st for a diagnosis, and they told me that I had a minor blown head gasket, which was leaking coolant into my cylinder 1 causing the misfire when the engine was cold. They can tell because, they checked the spark plug for wetness after leaving the engine off over night. As the engine heats up, the misfires stops because the gasket expands and creates a seal. They used the scare tactic to tell me that I will need a new gasket or I would need to sell the truck within a few weeks because the engine will soon start over heating, leaving me stranded on the side of the road. The repair would cost $2500, which include the gasket inspection of the head for cracks, machining the head, and obviously reassembly. Check out the photo attached the recommendation.I got super depressed that I would have to give my baby up soon, as she and I have gone through so much together, so I started to research the problem and came across this Head Seal and a similar product from another brand. After watching a few testimonials on YouTube, I decided to give it a shot. Being a total beginner in auto mechanics, I didn’t understand how to drain the coolant properly, so I made a mess, but got the Head Seal liquid in and ran the engine as instructed on August 4th.I kept my eye on my OBD with my android tablet almost every day, and found a cylinder 1 misfire “pending” in the app five days later on August 9th. My check engine light came back on the next day on August 10th, and I got depressed again. I cleared it and kept driving, as I started to shop for a new truck. Well, it’s September 6th almost a month since the last misfire, and there hasn’t been a new one. I keep the tablet in the truck most of the time to run diagnostics, and still nothing.Here’s my theory: Because I only had a slight leak, the nano particles took a few heating and cooling cycles to really get in the cracks and cure into place. Therefore, it’s a slow process, especially for an intermittent leak like mine. I try not to rev my engine over 2500 rpms, and drive slow while it heats, which probably helps too.So far so good! I keep my tablet in the car to keep an eye on the thermometer as well, and the coolant stays at about 88 degrees Celsius when driving on the freeway, which is perfect. As soon as I see an uptick of one or two degrees, I’ll flush my coolant. I’ve gone on several 100+ mile trips also in the last month, and it’s holding up.It’s been a roller coaster ride (not the product, but my experience with my truck) but I’m glad things are stable. Will update if anything pops up in the next few weeks, but it looks like this seriously saved me $2460, at least for the time being. Knock on wood. If you’re having these issues, good luck, and may the force be with you!
Lord Kronos –
So, the last(only) winter storm in Texas, cracked my radiator and damaged the engine inner cooling walls somewhere in the block. This caused my oil and radiator fluid to mix and was visible by the “milk” on my oil cap.Replaced radiator, hoses, head gaskets to spec, water pump and timing belt while I was in there. Car was still dumping radiator fluid in the engine internals.I added this stuff per directions and wherever the crack was it has been sealed. I have been driving to work everyday for about 2 months now, towed some stuff, smoked my clutch a bit and no oil water mix.I do not know how long this fix will last but I plan on purchasing a refurbished block so it was certainly a much cheaper and convenient fix at the time.Downside, my car will start to overheat on the highway going 75 after work with the AC on in the Texas heat, but I attribute that to this stuff most likely clogging the radiator a bit. It never reaches critical temperature so I am still satisfied with the results; I just roll down the windows and sweat it out.06′ Kia Spectra 2.0 STD Trans, 145,000 miles….yes I tow with it.Update as of 6.7.2022This product did not fix the issue permanently. I have suffered more milky residue, loss of fluid levels over time and overheating issue cause by loss of fluids. However, in comparison to what it was before it is still an improvement. My engine was at the end of its life and this product has stretched it out a much longer than if I had done nothing. I am fairly certain my cylinder bores are now as rough as sandpaper but the engine still holds compression, runs and get me where I need to go.
Prince –
After my engine had a seizure (violent shake) one night, I discovered the symptom was due to gasket leak. I stopped driving the car and bought one of these Bar’s Leak Gasket Repair. Due to the size of my radiator on my Hybrid vehicle, I only needed to use 1/2 of this fluid poured into the coolant reservoir tank. Follwed the direction step by step. Next day when I started up the engine, the gasket leak was fixed.Update: About 10 weeks of running without any issues, the gasket leak symptom returned. I will use the other half of Bar’s Gaket Leak Repair fluid and see if it’ll go longer or shorter than 10 weeks.FYI: On the box it says that a small leak will require Bar’s Leak Repair about once a week and bigger gasket leak will require daily.
Wandershopper –
Follow instructions in detail, also watch videos of successful applications. Many failed to what seems to be erroneous application.Drained, refilled then drained again the rad to get most of the coolant/motor oil gunk out. Then followed the instructions, including the a/c, heat on/off process. Filled it with coolant and Bar’s then did the whole warm-up engine, rest. Drive 15 mins, cool down, warm-up routine.Spent a good part of the day performing all these, but that was over a year ago already. How far would my $26 have gone if I went to a Mercedes mechanic.
Mason –
Got a 2007 Saturn vue with a small head gasket leak. Noticed little milky color in my oil and seen my coolant was like 8-10 FO lite. So I knew the head gasket had a small crack in it. Seen Chris fix review on this so trying it out. My leak it small so we will see how good it works. Will update if the engine blows or something different happens, but if it stays the same and runs fine, this will be my review.
Adam –
Just be sure to follow the directions!My car was overheating under a load. Confirmed it was gasket or block; neither of which I was equipped to fix or could afford. Used this, and have been driving it for several months without issue.