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

Best product

My car was losing around 800ml of coolant per week. I tried using the recommended dosage and when that didn't work, I tried "overdosing". Both had zero effect on the leak. YMMV.

One of those things you should toss a couple in every vehicle just as a pre caution

اوقف التسرب من اليوم الأول بعد معاناة لسنوات - شفرولية كروز ( يجب طحن المنتج ووضعة في الراداتير مباشرة أو في الخرطوم العلوي الواصل للرادتير لو دورة التربيد مغقلة ) ممنوع تضعة في قربة المياة

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.

The fact that GM "makes" their own pellets to compensate for OEM parts not being sufficient to do the job on their own should speak volumes. Yes, they work. They are not going to get you off the side of the road, but if you have small seeps here and there after performing proper part changes, they aren't bad insurance for the price.