Radiator Stop Leak 325ml

Product code: WYN55864

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£6.99

£5.83 ex. VAT

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Wynns Radiator Stop Leak 325ml

Part Number: WYN55864

Wynns Radiator Stop Leak is a specialized cooling system treatment formulated to seal small leaks in radiators, heater cores, water pumps, and cooling system gaskets. This 325ml formula contains sealing agents and conditioners that locate and plug minor leaks while conditioning the system to prevent future seepage. The non-clogging formula works safely without restricting coolant flow, offering a convenient and cost-effective solution for small coolant leaks without mechanical repairs.

Product Characteristics

• Seals small leaks in radiators and heater cores quickly.
• Reconditions gaskets and O-rings to stop seepage.
• Helps seal weeping water pump seals.
• Non-clogging formula won’t block coolant passages.
• Provides preventative protection against future leaks.
• Safe for use with all coolant types and systems.
• Helps seal porous metal in aging radiators.
• Remains active in the system for long-term protection.
• Easy to apply directly to radiator or reservoir.
• More economical than replacing system components.

Storage & Shelf Life: Store in a cool, dry place in tightly closed original packaging. Protect from frost and direct sunlight. Shelf life 5 years from production date.

How to Use

• Ensure the engine is completely cool before opening the cooling system.
• Shake the bottle well and pour entire contents into the radiator or coolant reservoir.
• Top up with coolant if necessary to maintain correct level.
• Run the engine at normal operating temperature with the heater on maximum for 10–15 minutes.
• For preventative use: add once every 12 months.
• For active leaks: results typically visible within 200 miles of driving.

 

Radiator Stop Leak is especially effective for pinhole leaks, weeping joints, and minor gasket leaks in older vehicles or as a temporary repair until proper service can be carried out. Not intended for repairing large cracks or severe system damage. For best results, use Wynns Cooling System Flush before adding this product to maximize sealing performance. Compatible with traditional green antifreeze, extended-life coolants, and OAT-based coolants.

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