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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

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

Q: Do you just add to radiator whilst full or do you have to drain radiator first ?

If your radiator is full,then it sounds like you don't need it. But if you can't see the water, then pour the stuff in and top up with water. Then away you go. Don't forget to check later on.

Q: What colour liquid is this please ? Will it change the coolant colour. thx

No, it won't change the coolant colour - it's the colour (and texture) of wallpaper paste

Q: Hi will this work on my heater core ?

Not sure - I think it would depend where in the core the leak is and what material it's made from (so probably unlikely to work with plastic components or leaks from pipe attachment points, for example). But considering how difficult most heaters are to replace it's got to be worth a try.

Q: Could this be used for central heating as I have small drip at bottom of radiator

Radiator stop leak is designed to mix with car coolant running at much higher temperatures than domestic boilers. Plus the mix ratio would be out. Wouldn't know how many litres of water in heating system. Can understand why hypothetically it could work but don't try it. If its an emergency fix try using CT1 sealant on the external section where leak is on radiator if you can see it. (Not in the radiator!)

Product ID: 47966303

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Details

Material
Rubber
Brand
Wynn's
Style
Compact
Item weight
0.37 Kilograms
Item dimensions L x W x H
4 x 22 x 83

🔥Prevents overheating & coolant loss

🛠️325ml advanced sealant volume

🛡️Protects against rust & corrosion

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Wynns Radiator Stop Leak 325ml

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Description

🛠️ Seal the deal on leaks before they seal your fate!

CORROSION DEFENSE - Fights rust and corrosion to extend your cooling system’s lifespan and save costly repairs.
SYSTEM SAFE FORMULA - Gentle on hoses, gaskets, and sensors—no blockages, no damage, just smooth performance.
LEAK PROOF CONFIDENCE - Seals minor radiator & head gasket leaks fast, keeping your engine cool and reliable.
UNIVERSAL COMPATIBILITY - Works seamlessly with all coolants, antifreeze, and OAT fluids across petrol, diesel, and LPG engines.
PRECISION TEMPERATURE CONTROL - Maintains accurate sensor readings to prevent overheating and optimize engine efficiency.

Wynn's Radiator Stop-Leak is a 325ml advanced sealing solution designed to quickly fix minor leaks in radiators and head gaskets. Compatible with all coolant types including OAT fluids, it protects rubber hoses and sensors while preventing corrosion and rust. Ideal for petrol, diesel, and LPG engines, it ensures optimal temperature control and prolongs cooling system life without clogging or damage.

Specifications

Manufacturer	Wynn Oil UK
Brand	Wynn's
Model	Wynn's 55864, Radiator Stop Leak, 325ml
Product Dimensions	0.45 x 2.16 x 8.3 cm; 370 g
Item model number	WY55864
Manufacturer part number	55864
Item Weight	370 g

Have a Question? See What Others Asked

Do you just add to radiator whilst full or do you have to drain radiator first ?

What colour liquid is this please ? Will it change the coolant colour. thx

Hi will this work on my heater core ?

Could this be used for central heating as I have small drip at bottom of radiator

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