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Red Line WaterWetter 12oz Bottle - Universal
Red Line WaterWetter 12oz Bottle - Universal

Red Line WaterWetter 12oz Bottle


Read 4 Reviews | 3 Q&As
Part # 80204

In stock!
Universal part

Features & Product Details

RallySport Direct proudly carries some of the best automotive lubricants, fluids, and lubricants in the racing industry brought to you by Red Line. 


Red Line WaterWetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30ºF. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze. Or it can be added to new or used antifreeze to improve the heat transfer of ethylene and propylene glycol systems. Water Wetter is designed for modern aluminum, cast iron, copper, brass, and bronze systems. It is compatible with all coolants, including the latest long-life variations.



  • Doubles the wetting ability of water
  • Improves heat transfer
  • Reduces cylinder head temperatures
  • May allow more spark advance for increased torque
  • Reduces rust, corrosion and electrolysis of all metals
  • Provides long-term corrosion protection
  • Cleans and lubricates water pump seals
  • Prevents foaming
  • Reduces cavitation corrosion
  • Complexes with hard water to reduce scale
  • Sold in a 12 FL OZ bottle
  • Specifications

    Brand: Red Line
    QTY: 12oz
    Type: Coolant Additive
    Mfgr. Warranty: No Warranty
    Condition: New Product
    Return Policy:



    4 Reviews
    5 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
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    1 of 1 people found the following review helpful
    great product! 6 years ago
    5out of 5stars

    my 2011 WRX was past 60k miles so i flushed the old coolant and put new Subaru 50/50 Super Coolant along with Redline Water Wetter. subaru 50/50 super coolant + redline water wetter = killer combo for spirited/quick driving on street and highway.
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    Great stuff for the track! 7 years ago
    5out of 5stars

    When I road raced superbikes with the MRA I used this stuff in my HondaCBR600RR and I plan on continuing to use it with my WRX for track days! This stuff is amazing! Most of the tracks I go to don't allow you to use antifreeze incase it gets on the track. With the water wetter, it's a drastic cooling difference over straight water, especially on the hot days. Easy to mix, just follow the directions on the bottle! I will add that during the winter I drain my coolant system and go with Engine Ice antifreeze with 1/2 the recommended amount of water wetter in it as I'm not on the track during the winter months.
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    0 of 1 people found the following review helpful
    great product 9 years ago
    5out of 5stars

    Im slowly falling in love with redline the more products I use the more well behaved my wrx is. Dropped overall coolent temp substantially running 50/50
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    great for track use 10 years ago
    5out of 5stars

    i use this with straight water for the track, it cools better than Glycol, & trust me when I say you don't want anti freeze going on your back tires on the track!! other drivers will appreciate it also. you just have to remember it offers no freeze protection.
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    • Q: How much?  justinpozzolo531158 years ago

      Ok I have a 2009 sti with the koyo radiator. How much would I need? I drive in really cold conditions so I cant use water..just coolant. Can I mix this with straight coolant? Do I even need this?
      • 0 of 0 people found the following answer helpful

        A:  1 bottle will service a entire system. As for your vehicle, you do not want to run straight coolant as it causes issues with thermal dissipation. As contrary to the name, 100% straight coolant with no water has very poor thermal dissipation properties and needs to be mixed with water. Follow the instructions on the coolant bottle for proper mixing for your vehicles operation conditions.

        Kirill C. @ RallySport Direct 8 years ago  
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      • 0 of 0 people found the following answer helpful

        A:  Oh that's right it isn't straight bad.

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    • Q: Mixture  sphillips.islreal734028 years ago

      So for optimum cooling efficiency do I mix this in equal parts to water? So if I use 1 quart water wetter with 1 quart water?
      • 0 of 0 people found the following answer helpful

        A:  Redline recommends 1 ounce of water wetter for every quart of water for maximum efficiency.

        Zach G. @ RallySport Direct 8 years ago  
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    • Q: Proportion  m1k1e201758 years ago

      How much would i need for a stock STI 09 and the Koyo Aluminum Racing Radiators? What would be the optimal proportion? As I understand I can mix it with either water or coolant?
      • 0 of 0 people found the following answer helpful

        A:  Redline recommends 1 ounce per quart or 1 bottle for cooling systems with capacities of 12-20 quarts. For optimal cooling you can the same proportion with water only. This WaterWetter will work with water or mixed water and antifreeze.

        Zach G. @ RallySport Direct 8 years ago  
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    This Part Fits

    Universal Product
    This item is non application specific.
    Please verify compatibility before purchase. May require some modification for proper installation.