Wynn's Radiator Stop Leak
Wynn's Radiator Stop Leak
£ 5.95
Add to coolant to seal troublesome coolant leaks (325ml)
In Stock

Compatible with all coolants and anti-freeze, Wynn's Radiator Stop Leak will seal small leaks without damage to rubber hoses, gaskets or other system components. One 325ml bottle treats a typical cooling system (from 5 to 12 litres).


  • Stops and prevents leakages in the radiator, cooling and heating system.
  • Stops head gasket leaks.
  • Will not harm rubber hoses, gaskets or other system components.
  • Is compatible with all antifreezes and coolants, also with OAT coolants (Organic Acid Technology).
  • Is formulated to avoid clogging of radiator waterways and temperature sensors.
  • Enhanced protection against rust and corrosion.
  • Recommended for all "water" cooled systems of petrol, LPG and diesel engines when minor leaks are noted.
  • Can also be used as preventive agent.
  • Warm up the engine with heater control in HOT position.
  • Shake bottle well and add 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 if a single hose overflow tank is fitted.
  • Top up the system with coolant if required.
  • Run engine for approximately 5 minutes to circulate and stop leaks.
  • If the coolant is dirty, flush system with Wynn’s Radiator Flush and refill with new coolant before treatment with Radiator Stop Leak.

Note: Radiator Stop Leak will not repair broken or split hoses.


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