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Royal Purple 01650

Royal Flush Cooling System Flush 12oz. Bottle

Royal Purple 01650


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Royal Purple 01650 Royal Flush Cooling System Flush 12oz. Bottle $5.27
Royal Flush Cooling System Flush
  • 12oz. Bottle

  • Royal Purple 01650 Details

    Cooling System Flush

    For best results use Royal Flush per the following instructions:

    With the engine off and cool, open the radiator drain petcock and drain the coolant into a container for proper disposal. Close the petcock, pour in Royal Flush (for small systems like motorcycles the entire contents may not be appropriate), then fill with water. Replace the radiator cap, start the engine and turn the heater on high. Run the engine for at least 10-15 minutes or take a short drive. Please be aware that Royal Flush is completely safe for the cooling system and is non-corrosive. Therefore Royal Flush can be left in the cooling system for an entire day or more. If you choose to leave Royal Flush in the vehicle for an extended period, try to do this during a period of above freezing ambient temperatures. Neither Royal Flush nor Purple Ice provide any anti-freeze protection or boil over protection, so avoid overheating the engine.

    After the flushing with Royal Flush is complete, turn off the engine, allow it to cool, open the drain petcock and drain into a disposal container. Then flush the system thoroughly with water. Close the petcock and refill the cooling system with straight water. Replace the radiator cap and run the engine again for at least 10-15 minutes. Turn off the engine, allow it to cool and drain and flush again with water as before. After the water flushing is complete, drain the water, close the petcock and refill with an appropriate water/antifreeze mixture for proper freeze protection in your region and replace radiator cap.

    For best results and to improve heat transfer and corrosion protection also install - Purple Ice Radiator Coolant Additive


    Manufacturer's Part Number:

    Royal Purple Cooling System Flush
    Royal Purple Royal Flush Cooling System Flush is designed to clean, restore and maintain an engine cooling system. Royal Flush uses a unique proprietary formula with technology that was originally developed to clean expensive, industrial heat exchangers and cooling towers. This technology is not available in any other automotive cooling system cleaner or flush on the market. Royal Flush is highly concentrated to effectively remove all contaminants in the cooling system including; acidic build up, corrosion byproducts, oils, slimes, scums and gels. The pH balanced properties allow it to be a single step product that does not require a post flush neutralizer.

    Royal Flush optimizes heat transfer and restores cooling system efficiency by maintaining clean metal surfaces inside engines and radiators. The contaminants in water, inhibitors in antifreeze and tiny rust particles become insoluble and form antifreeze gels over time. Royal Flush features industrial grade detergents that chemically "scrub" to remove contaminants and corrosion inhibitors that "prime" metal surfaces inside the cooling system. This process prepares the cooling system for follow up treatment with Purple Ice.



    • Optimizes cooling efficiency and prevents overheating
    • Cleans radiator and entire cooling system
    • Neutralizes combustion byproducts
    • pH balanced to protect aluminum radiators

      Recommended Treat Rate: One (1) 12 ounce bottle will treat cooling systems with a coolant capacity of up to 16 quarts. For cooling systems with a coolant capacity of more than 16 quarts, it is recommended to use two (2) bottles of Royal Flush.


    01650 is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from Royal Flush! Another Quality product of Royal Purple's arsenal-it does what it says...
    Date published: 2016-08-07
    Rated 5 out of 5 by from Great product works very well This really cleaned it out very well will buy again.
    Date published: 2016-03-28
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    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations