PLT11 PNG

Pelletized Heavy Duty Stop Leak

Radiator leaks can be very overwhelming, especially when you don’t have the time or money to take your car to the repair shop. Well, it’s time to ease your worries because we have created this fast and easy-to-use product that seals internal, external and coolant-to-oil leaks.

Our Bar’s Leaks Pelletized Radiator Heavy Duty Stop Leak is specially formulated to seal larger leaks better than other stop leak products. It works safely and effectively on plastic, aluminum and metal radiators, heater cores, gaskets and freeze plugs. It also has a water pump lube that lubricates water pump seals and inhibits the formation of rust and scale.

In under an hour, you can quickly and easily solve that once-dreaded leaky radiator. Give it a try and get your show back on the road in no time.

Part Number: PLT11
Dosage: Use 1 bottle for 6, 8 and 10 cylinder gas or diesel engines. For 4 and 5 cylinder engines, use ½ of liquid and pellets.
Size: 11 fl. oz. (325 mL)

Testimonials & Reviews

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  • I wanted to write and let you all know that I am so very happy that your product is one that works… I only wish that I would have trusted in this process a little while sooner. My wife’s van developed a leak that came from the underside of the rear of her engine. After careful inspection by both me and a local repair shop, it was thought that either the intake gasket had failed or the head gasket. I spent two and a half days breaking the entire engine apart and replacing the intake gaskets and putting it all together just to once again see the leak when I was all complete. As frustrated as I was, I went to the local parts store and shared my frustration. They recommended Bar’s Leaks Radiator Heavy Duty Stop Leak. To be honest, I wasn’t much of a fan of those stop leak products but I sure didn’t want to spend another $300-$400 on replacing the head gaskets and the intake gaskets (of which I just replaced hoping it was the least of the two projects). I bought a jug of your product serial number 046087000472 and within 20 minutes of running the car, THE LEAK WAS GONE!!! I can’t believe it! It has been almost 4 months since I did this weekend project and still no leak! I just wanted to let you all know that you have changed my thinking about Bar's Pelletized Stop Leak. I will recommend your product to anyone who has a leak, before they repeat what I did and spend all that money on a wasted weekend of frustration. Thank you!

    D. C. Sr. - Hayward
  • I guess this is not a question really, but a testimonial. I work in the fast lube industry, and deal with additives every day. When I had vapor and fog coming out of my vents in my '96 F350 with a Powerstroke Diesel, my heart sank, having replaced it less than 6 months ago with a new core. I will admit, when the idea of radiator stop leak products came to mind, I doubted it would work. I don't really believe in pour in fix-alls just because of the additives I sell, I don't really believe in. I went out on a limb and got a bottle of Pelletized Stop Leak and poured it in the top hose, after dissolving the pellets in hot water. I poured it in and didn't expect anything to happen. Drove it for 5 minutes, and my windows were fogged up. I cleaned the windows and kept driving. Only a little fogging, and after 20 minutes it was done. Fixed! I couldn't believe it. I would definitely recommend this to anyone I know. I remain skeptical of other "rebuilds in a bottle" but I would sure buy Bar's Leaks again. Bar's, thank you for making a great product that actually works. Feel free to post this as a testimonial. Love the product!

    M. L. - Pleasanton
  • I used The Radiator Heavy Duty Stop Leak in my 96 Acura TL 2.5 five cylinder car with 220,000 miles. I don't have a temp gauge that goes past the midway point anymore. The cooling fan doesn't kick on anymore. I don't have white smoke coming from the hood area anymore. The product did what it is supposed to do -- it sealed up an internal leak in my cooling system my eyes could not see. I will be checking into some of your other products, if and when the time comes. Thanks for putting out a product that WORKS.

    K. B. - Newnan
  • The heater core in my GMC truck was leaking steam from a tiny crack. Required removal of entire dashboard to repair -- either a $600 job at a shop or two days laying on my back in the truck trying to do it myself. Tried Alumaseal, it didn't work. With little hope left, I bought an 11 oz bottle of Bars Heavy Duty Stop Leak, poured it in, and started driving the truck around on errands. About 45 minutes later, the steam coming out of my heater vents suddenly stopped and the smell of anti-freeze vanished. The leak was fixed and has stayed that way since. Thanks for saving me $600, Bar's!

    S. T. - L.A.
  • I used the PLT11, Heavy Duty Radiator Stop Leak. I own a 1991 Nissan Maxima with 95,000 miles on it and for the past few months it started to leak coolant. I think it was in the water pump seal area or even the heater core, anyway I added the radiator formula and not only did it stop the leak, the heater works like it did when new. Thanks.

    G. G. - Easton

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