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

Worked a treat, waterpump leaking but couldn't get it done until the cambelt was changed, it fixed the leak until it was done, definitely 5 star's

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 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.

Great product does what it’s supposed to

It works! Car was losing ~300ml of coolant a day. I put a bottle of this stuff in, topped up the coolant then ran the engine for 15 minutes and switched the car off overnight. A few drips on a short drive the following morning, and nothing since (4 days, 80 miles). Only supposed to be a stop-gap so time will tell as to how it holds up.

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 have not tried it yet. Its not as if I can see any water leaking from my radiator but the water keep shortening. So I thought I should try this product

I was losing around a litre a week of coolant via the water pump. I literally just poured this in, idled the engine for 10 mins and then left the car turned off overnight. That was 3 weeks ago and since then I haven't had to top it up once. I'm always scepticle with these additive solutions but certainly for me in this instance it worked with the kind of leak I had. The advantage unlike k-seal is it doesn't leave shiny metal flakes in the coolant reservoir, it's just a milky fluid.

حسب الاحتياجات

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

This sealant was very helpful in stopping a small leak in my F150 cooling system. Been in there a year or so and still working.

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

Works awsome