🛠️ Seal leaks, stop stress — keep your engine running flawless!
Wynn's Radiator Stop-Leak is a 325ml high-performance sealant designed to quickly fix minor leaks in radiators and head gaskets. Compatible with all coolant types including OAT fluids, it protects hoses and sensors while preventing corrosion and rust. Ideal for petrol, diesel, and LPG engines, it ensures accurate temperature control and prolongs cooling system life.
| Manufacturer | Wynn Oil UK |
| Brand | Wynn's |
| Model | Wynn's 55864, Radiator Stop Leak, 325ml |
| Product Dimensions | 1.8 x 3.38 x 9.22 cm; 370 g |
| Item model number | WY55864 |
| Manufacturer part number | 55864 |
| Item Weight | 370 g |
C**P
It really works!!
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.
K**D
Does exactly what it says!
Works perfectly, my daughter had a small leak in her radiator and I put this in and it's been perfect ever since. No issues at all and saved us a fortune at the garage! Highly recommend
D**L
Worked for me on water pump
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.
S**H
Does what it says.
After losing water for some time now I have decided to try this after seeing mixed reviews.I can honestly say that this has stopped the leak .It's only been a couple of days since i have used it and have noticed the coolant hasn't moved at all.I will obviously keep an eye on it, if anything changes I will report it on here, but for the time being all is good.
M**Y
Fixed leak.
Fixed leak...so happy.
S**R
Didn’t work in my case
I tried this to fix what looked like a small leak in the coolant hoses system, it didn’t work in my case but didn’t cause any issues to my car.
A**R
Very effective.
Easy to use sorted small leak I discovered the day before a driving holiday to Europe. Put it in two years ago, still no leaks . Great !
T**7
DESTROYED MY ENGINE!!!
TOTALLY DESTROYED MY ENGINE!!! This product, I believe has cost me £13,000!!! I used it to stop a radiator leak, which it did at first, but at the same time it blocked things it shouldn’t , and resulted in pressure building and water being forced into my engine! The engine over heated. Head gasket blown, block cracked - car a written off! Normal car insurance doesn’t cover this do GOODBYE £13,000!!! Why risk this - just get a new radiator!!! Worst decision I ever made using this product!! Most car mechanics will tell you NOT to use this!! LISTEN TO THEM!!!!
Trustpilot
4 days ago
1 week ago
