Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml

My car started leaking water from the cooling system, it slowly got worse yet we couldn't work out where it was leaking. I was having to top up my coolant every 2-3 days. Even my local garage said it's going to have to get worse before we can see where it's leaking!! Decided to buy some of this as the reviews were good, poured it in the radiator, drove it around 5 miles, no more leaks!! This has been in my car around 3 or 4 months now and still not had to top up my water. Fantastic stuff, will 100% recommend this product as it's solved my water leak. Obviously for major leaks or split hoses etc this will not be suitable.

I had a really small leak from my coolant system, but enough that I had to top up coolant every other day. I used this and it's cured it amazingly. Really great stuff.

I tried what i thought was the best on (K Seal) which didn't work. then i tried this stuff, miles better, worked a treat. If i need to stop a small leak now this is the stuff i would buy again.

Certainly stopped my water leak

So far I am very impressed, honestly thought this was a load of rubbish. I poured the whole bottle into the coolant tank and it seems to of completely stopped my coolant leak. Lets see how long it lasts. Max coolant temp is now 105 When driving motorway drops to 80-90 Good result. Update my corsa has started leaking again, but the leak is minor. Still a good temporary product in my opinion. I also used this on my smart roadster brabus and the leak has stopped for now and the temperature is good.

Not sure as some review are mixed review, not sure if instruction were not followed properly... It says at back of bottle that to [warm up the engine with heater control in HOT position] ... meaning, this is BEFORE pouring the additive. Its not clear what is the warm amount. Some car (old) can heat up high temperature in few minutes compared to newer cars. Do not take any risks to open coolant cap as it may be dangerous. Second part it says [add the contents to the cooling system: via the expansion tank if part of the system circuit (2 hoses: out and return), or directly into the radiator of a single hose overflow tank is fitted.] .. WTF lol, i lost it, didnt bother and returned it.

I bought this to see if it could fix what i suspected was a radiator leak on my Renault Clio. Although I knew it wouldn't be guaranteed, as there could be any number of causes, it was worth a try. The application is simple, pour the bottle into the coolant reservoir, I drove gently for a few miles, expecting the warning light to come on - it didn't. Around 1,000 miles later, still no sign of coolant loss. For me, this worked brilliantly, and saved me a fortune in diagnostic or repair bills had it needed to go the garage. Well recommended if you think its a minor leak in your radiator.

Unable to use as intended as fluids not low enough...

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Good stuff. Stop works

Avevo una perdita al radiatore del riscaldamento abitacolo della mia Accent vecchia di 13 anni e con 180.000 km alimentazione benzina/gpl. La perdita era minima e non si notava diminuzione liquido nella vaschetta di espansione ma si sentiva odore di liquirizia bruciata (tipica del liquido antigelo scaldato) e un anomalo appannamento dei vetri dovuti ai vapori di paraflu. Ho utilizzato Wynns radiator stop leak seguendo le istruzioni ed ha funzionato alla grande. Ho percorso ad oggi 1000 km senza alcun problema ulteriore. Il prodotto è liquido e va utilizzato l'intero contenuto del flacone inserendolo a motore caldo (ma non caldissimo) direttamente nel radiatore (fare attenzione se troppo caldo il tappo all'apertura) o nella vaschetta di espansione (eventualmente aspirare con una siringona e un tubicino liquido raffreddamento prima, per fare spazio al volume del prodotto da inserire). Nel mio caso la soluzione è arrivata dopo aver percorso circa 20 km e da allora non ho avuto più problemi. Vedremo in futuro se la soluzione regge. Le istruzioni sul flacone sono in inglese ma sul sito del produttore è possibile scaricare la scheda tecnica del prodotto e tutte le istruzioni in italiano

Bonjour Je confirme ce que dit le premier commentaire Produit très efficace Il suffit de laisser tourner le moteur ou de rouler quelques km chauffage a fond, le produit va vite circuler dans tout le circuit et colmater les petites fuite J'avais une fuite depuis des années qui s'aggravait, je devais mettre régulièrement du liquide pour compenser cette fuite, je ne savais pas que ce type de produit serait aussi efficace sinon je l'aurais utilisé bien plus tot De plus son pris est contenu et cette marque est réputée Je recommande ce produit

fixed a small radiator leak in the dashboard. can be advised