ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g (Pack of 5)

I have a 2013 Prius, 3rd generation . 210,000 miles. It had been running perfect, when it developed very rough engine noise and severe shaking from time to time when starting. Once underway the car ran normal. A couple of well reviewed mechanics were unable to figure out the cause of the problem. One even said the engine had something lose inside and wasn't worth fixing and should be sold for junk. That made no sense to me. Said he would give me $500 for the car as a trade on one of the used cars he had for sale. The other mechanic said he was certain the head gasket was not leaking (I suspected it was the problem until I got that advice) The check engine light came on and the code said the problem was with the #2 cylinder. I decided to use the internet to find an answer. Turns out this generation of Prius often suffers from the head gasket leaking a bit of water often into the number 2 cylinder. It's a somewhat common problem at around 200,000 miles. Number of options. 1, replace engine with a new or rebuilt or use a low mileage engine from Japan. 2. replace the head gasket. Costly options on an older car with lots of miles. fortunately, I came across a retired mechanic who was aware of the problem and suggested as a first and least costly option, I buy and use this AC Delco product to try and stop the leak. Said he used it on his own car with good luck. Said he was into the second year after using it once and no leaks. I bought it and put into the engine per the instructions. It has now been over 1000 miles since I used the product, only one application, and NO PROBLEMS!!! Talk about a cheap and effective fix. Plus it pin points the cause of the problem. So much for considering top mechanics as the last and best word on my problem. Two lessons learned. 1. This a great product so far. If problem shows up again I will just repeat the fix and take from there. Could not ask for more. 2. The internet is wonderful tool to use to help solve a problem, if only you will take the time and effort to use it fully.

Works Great

2014 Sierra - I had a very small radiator leak that I could smell but it did not drip enough to get to the ground. This fixed it, no longer smell it and quit losing antifreeze.

Had a leak and it sealed it quickly. Easy peasy.

Great for radiators! It's very beneficial for the operation of your vehicle. Recommend using these ever so often

These are what GM used to put in all cars as they left the production line and were filled with coolant. Fixes small issues in the metal parts. I've used these in every car I've owned for 25 years just to make sure I don't get leaks from porous head castings ect. These wont hurt you cooling system as they are ground shells.

Actually stopped a small leak in the radiator of my jeep grand cherokee. Beats replacing the radiator for the time being.

These are Effective at Stopping Minor Leaks in The Cooling Systems Of Vehicles. Follow The Directions!