RED LINE Water Wetter Super Coolant Additive 12oz
All Prices Include VAT
RED LINE WaterWetter is a high-performance coolant additive designed to significantly reduce engine running temperatures and improve cooling system efficiency. It does not contain antifreeze and is intended to be added to water or existing coolant systems.
Used and trusted in motorsport and high-performance applications, WaterWetter works by doubling the wetting ability of water, allowing coolant to make better contact with hot metal surfaces. This reduces surface tension, helping eliminate insulating air bubbles and vapour barriers that form on cylinder heads and engine components — resulting in coolant temperature reductions of up to 20°C.
In racing or track-focused applications, WaterWetter allows the use of straight water or reduced antifreeze concentrations, improving heat transfer while still providing excellent corrosion protection. Lower cylinder head temperatures can also allow for additional spark advance, helping unlock improved engine torque.
RED LINE WaterWetter provides long-term corrosion inhibition and is safe for all common cooling system metals, including aluminium, cast iron, steel, copper, brass, and lead. It also helps protect water pump seals, reduces cavitation, and prevents foaming under high load.
At Rennworks Performance, we supply WaterWetter as a proven solution for road, track, and motorsport cooling optimisation, including Porsche and McLaren performance applications.
Key Benefits
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Reduces coolant temperatures by up to 20°C
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Doubles the wetting ability of water for improved heat transfer
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Reduces cylinder head temperatures
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May allow increased spark advance for improved torque
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Reduces rust, corrosion, and electrolysis
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Provides long-term corrosion protection
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Cleans and lubricates water pump seals
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Prevents foaming and reduces cavitation corrosion
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Helps reduce scale caused by hard water
Application & Dilution
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Type: Concentrate
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Dilution Ratio:
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1 oz (30 ml) or 3–4 capfuls per 1 quart (0.94 litres) of water or coolant
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Important Information
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Coolant additive only – does NOT contain antifreeze
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Suitable for use with water or glycol-based coolants
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Ideal for performance road cars, track cars, and motorsport use
We offer professional installation services directly in the Rennworks workshop, where your product will be expertly fitted and fully set up for optimal performance. To book an installation appointment, simply contact us and we’ll be happy to arrange a time that suits you.
Not sure if this product is the right fit for your vehicle? We’re here to help. Our team can quickly check compatibility and make sure you’re choosing the correct item before you buy. Just reach out with your vehicle details, and we’ll confirm everything for you.
Some product images are for illustrative purposes only and may show a generic or representative version of the item. Actual components may vary slightly depending on vehicle application or specification, but all products supplied will match the description and meet our quality standards.
Most orders are processed within 1–2 business days and usually ship within 3–7 business days. Not all items are held in stock, as some products are bespoke and made to order — for example, certain coilover suspension kits and exhaust systems — and delivery times may be longer in these cases. Where this applies, we’ll keep you fully informed and confirm expected dispatch dates as soon as possible. If you’d like to check availability or lead times, feel free to contact us before making a purchase.