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Bar's Leaks

Bar's Leaks Radiator Stop Leak Concentrate 6 oz

Average Rating:out of 5 stars
Walmart # 556542654
Was $3.40
NextDay delivery
on $35+ orders of only NextDay items.
2-day delivery
on $35+ orders

Arrives by Thu, Oct 22

Pickup not available

Sold & shipped byWalmart
<ul> <li>Stops &amp; Seals Coolant Leaks</li> <li>Seals Leaks in Radiators, Gaskets, Heater Cores &amp; Freeze Plugs</li> <li>Works with ALL types and colors of antifreeze coolant and/or water</li> </ul>

About This Item

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  • Stops & Seals Coolant Leaks
  • Seals Leaks in Radiators, Gaskets, Heater Cores & Freeze Plugs
  • Works with ALL types and colors of antifreeze coolant and/or water
Bar's Leaks® Radiator Stop Leak 2X Concentrate Sealer is specially designed to stop minor cooling system leaks and drips caused by normal cooling system wear and age. Works on ALL types and colors of antifreeze coolant and/or water. Item: 1194


Caution: Skin & eye irritant. Read instructions and cautions on back panel. Danger: Opening cooling system while engine is hot or running may cause severe burns. Keep out of the reach of children. Caution: Avoid contact with eyes. First Aid: In case of eye contact, flush immediately with water for at least 15 minutes. Do not take internally. After use, wash hands with soap and water.


Instructions: Cooling systems that are dirty or partially clogged should be flushed before usage. Shake well. Pour Stop Leak into a cool radiator. If direct access to radiator is not available, install in overflow tank. One bottle treats up to 3 gallons. Use 2 bottles for larger systems. Fill radiator and overflow tank to proper level and reinstall cap. Drive/idle engine for 15 to 30 minutes. If leak continues, second application may be required or mechanical attention is needed. Leave Bar's Leaks in cooling system for continued protection.


6 fl oz (177 ml)
Bar's Products
Price Per Unit UOM
Fuel Type
Bar's Leaks
Number of Customer Ratings
PPU Quantity of Units
1.0000 Each
Age Demographic
Product Name
Bar's Leaks Radiator Stop Leak Concentrate 6 oz
Is Reusable
Engine Type
Compatible Devices
6 oz
Manufacturer Part Number
Container Type
Radiator Additive and Cleaners
Assembled Product Weight
0.5 lbs
Assembled Product Dimensions (L x W x H)
1.60 x 2.40 x 5.00 Inches

Customer reviews & ratings

Average Rating:(3.3)out of 5 stars
66%Recommended(2 of 3)
5 stars
4 stars
3 stars
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1 star
Average Rating:(4.0)out of 5 stars

Bottle is too small to be effective.

This stuff really works but the bottle is a little too small to be effective. Go ahead and buy the larger bottle, more of the same product for just a bit more cost. If you don't need the whole bottle amount right now, you can save it for another time with the resealable cap.

Average Rating:(1.0)out of 5 stars

clogged the thermostat

This has to be the worst garbage that I have ever put into my car. I was losing fluid levels and overheating so I checked to be sure that the oil wasn't milky, inspected the hoses, changed the thermostat, flushed the radiator and the heater core as well as inspected the water pump but couldn't find a profound leak. At this point, on a short time budget, I put the Bar's radiator stop leak in the car. I was kind of grossed out by its appearance. It was thick and gloppy and I was a little apprehensive as I squeezed it out from the bottle and into the radiator but it was supposed to work according to the label and reviews, right? Over the course of the week the car started to be sluggish then difficult to start, then, all trouble broke lose at the worst time. Between work, appointments and regular daily life, within a 5 day period I blew 3 hoses before checking the thermostat again and found that it was completely clogged with the sludge that plopped out from that bottle. I eventually realized the root of my problem was a faulty radiator cap but not until after the costly repairs needed that were caused by this product. I am so frustrated that I fell for the "Magic in a bottle" theory that Bar's bestows.

Average Rating:(5.0)out of 5 stars

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1-2 of 2 questions
by NickskyOctober 22, 2017

1. Hello Nicksky, Thank you for writing to Bar's Leaks Technical Support with this concern after accidently adding the Bar's Leaks Radiator Stop Leak to your oil. The product could harm the internal parts such as bearing, lifters, valve etc. as it could restrict oil flow to those parts. If the product is installed in the engine oil and the engine has not been started, in many cases you can remove the valve cover and drain the oil leaving the drain plug off. Then use an engine flush washing out the head keeping special attention to the oil return holes that run down to the oil pan. Clean these out and pour the engine flush down these holes flushing everything into the oil pan and out the drain hole. If the engine has been run, you need to take the vehicle to have a professional mechanic evaluate what can be done to clean the inside of the engine. This might include taking the engine apart to clean all of the parts. If you have any other questions please get in touch with us at 800-345-6572. We are open 8 am to 5 pm EST.. Kind regards, Bar's Products Technical Support Team
by Customer Service Rep.
1 Answer
Last answer: October 23, 2017

by NanApril 14, 2020

0 Answers

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