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Wynns

Wynn's Cooling System Stop Leak 325ml

4.86 4.9/5 (14 Reviews)

Universally applicable

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  • Wynn's Cooling System Stop Leak 325ml
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Product number: 0108829

Manufacturer number: W45641

EAN: 5411693456411

£ 6.86

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In stock
Delivery Day after tomorrow

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  • Specifications

    Wynn's Cooling system stop leak

    Wynn's Cooling system stop leak stops and prevents small leaks in the radiator and the cooling and heating system.

    Properties

    1. Stops and prevents leaks in the radiator and cooling system.
    2. Improved anti-corrosion and anti-rust protection.
    3. Compatible with all antifreeze and coolants, including OAT coolant (organic acid technology).
    4. Will not repair split or broken hoses.
    5. Does not clog the hoses.
    6. Harmless to hoses, seals and other parts of the system.

    Applications

    1. For all “waterâ€? cooled systems of gasoline, diesel and LPG engines in case of minor leaks.
    2. Can also be used to prevent leaks.

    Instructions

    1. If the cooling system is very dirty, it is recommended to clean it first with Wynn's Cooling System Flush.
    2. Check the coolant level.
    3. Start the engine and let it warm up with the heater in the “warmâ€? position.
    4. Shake the can well and add 3 to 6% (0.3 to 0.6 l product per 10 l coolant) to the cooling system via the radiator cap or via the expansion tank with a fully closed radiator with flow system.
    5. Close the cooling system and let the engine run for about 5 to 10 minutes until the leaks are closed.
    6. Top up with coolant if necessary.
    7. The content of a 325 ml can treats cooling systems up to 12 liters.
    8. The content of a 1 l can treats cooling systems up to 37 liters
    applicationCooling system
    functionStop leak
    Content325 ml

  • Manufacturer

    Wynns

    Wynn's manufactures professional equipment and chemical solutions that ensure the optimal functioning of the most important parts of vehicles. For more than 65 years our R & D department has focused on the cleaning and lubrication technology for automotive parts. Our expertise of the current automotive needs is the key to our expertise. The Wynn's factories operate according to the ISO 9001 certified quality system. Several products have been certified by the German T'V, as well as homologated worldwide by a number of vehicle manufacturers.

  • Delivery time

    Expected delivery date:

    Day after tomorrow

  • Reviews 14

    • 5 By: Marco Groenink on 04-01-2026

      Used for the first time. No more leaks.

    • 4 By: Luc Verbeek on 19-09-2025

      After applying the cleaner, rinsing, and adding new coolant, the system began to foam and build pressure, causing coolant to be expelled through the overflow. I then applied the "Stop" button because someone said they knew anything about a leak in the cylinder head gasket's water channels. The pressure buildup was mainly from 2800 rpm and above, so it's on the highway. I haven't tested this extensively since, as it's about classic cars. It seems better when foaming stops.

    • 5 By: Jurgen Gent on 31-07-2025

      I didn't know what to expect, but it seems to be working well. I haven't had to top up the coolant yet. Fantastic!!! Saves me a rather expensive repair at the garage.

    • 5 By: Johannes Tomassen on 25-07-2025

      So far it works well on my 2nd car

    • 5 By: Daniel van veen on 13-04-2025

      Always handy to have when driving old cars.

    • 4 By: Arnold De Vries on 06-03-2025

      -no further explanation given-

    • 5 By: Gerben.Gjalt de vries on 07-02-2025

      no more leaks in the cooling system so people will start using this.

    • 5 By: Hans Hellinga on 07-01-2024

      Works great, takes some patience, but it really works

    • 5 By: Erik Bolhuis on 17-11-2023

      Had a leak at the thermostat house, after use the problem was solved.

    • 5 By: Rob van Dam on 26-02-2023

      Delivered quickly, no more leaks

    • 5 By: Bertus Boxem on 30-01-2021

      Great, after 2500 km. not yet refilled.

    • 5 By: Bronsgeest on 24-01-2020

      This product does what it says; I had a leak in my radiator and now no more. It is the second time that I have bought this in about 20,000 km, so it is certainly not a definitive solution.

    • 5 By: G.M.Jurant on 22-01-2020

      I had a leak under the head gasket, the agent stopped it, I recommend it

    • 5 By: R.W.Karelse on 13-09-2018

      excellent product has done exactly what it is intended to stop leakage

  • Questions?

    • 0108829. Wynn's Cooling System Stop Leak 325ml

    • In order to help you with your request, we require extra information about your vehicle. We would like to know: brand / model / type, year of manufacture, coach work, fuel, automatic transmission or manual, number of doors, VIN.

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