Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red

Easy to use and work done 💯, Very happy and value for money.

Used on Hyundai i40 1.7 cdti that had a very irritating slow leak from somewhere not obvious. I have no intention to plough money into this car.. it's a mobile tip! First time using anything like this as it goes against my inside engineer.... But to be fair, it's been a few months now since adding it and the coolant leak appears to be sealed!

Did the job

Seems to have stopped the leak. Always good value if it works. Suppose it depends on how big the mystery hole is.

Stopped the leak and 6 months on, there is no leak. I used it on a 3ltr diesel engine which would have cost hundreds to fix at the garage. It’s best to put it in and go on a long journey to get the system really warm.

Great product worked really quick I had a hair line crack in a plastic water pump housing sealed it up in seconds easy to use and wasn’t that expensive either

I bought two bottles because I thought one might not be enough. I poured the first one in, it didn't work, so I poured the second one in, and nothing happened either. Waste of time and money.

It works. Highly recommend.