Compatible with hoat (orange) coolant?

Yes. With all coolents actually.

How much will a 12 once bottle treat? I have a 5 gallon system and will be adding it to used coolant.

First of all I would flush & refill your coolant. I recommend Prestone 50/50 Extended Life even if your vehicle calls for Dex-Cool. Go to any place that does coolant flushes. Used coolant will not get the same results. In new coolant, the results will vary. Water Wetter will be pushed to it's limits but will still work in a 5 gallon system. The temperatures might not drop enough if stretched out that far in a large system to condone the price paid. If anything does work in this category though, it is either Water Wetter or Royal Purple's Purple Ice.

Do I add this to the reservoir or the radiator?

Add it to the radiator, if you can.

Can I use this with just distilled water in the winter without using antifreeze?

I have tested the water wetter at a ratio of 12 oz of to 116 oz of distilled water. i buried the gallon jug halfway deep in the snow and came out and checked the next morning early and the mix was still fluid. test this for yourself.

Red Line 80204 Waterwetter Super Coolant 12 Ounce 12 Pack

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Description

🔥 Stay cool, drive cooler — don’t let your engine miss out! 💨

VERSATILE COMPATIBILITY - Works seamlessly with all antifreeze types, including DEX-COOL and long-life glycol systems.
EASY ONE BOTTLE SOLUTION - Treats up to 5 gallons of coolant—perfect for most passenger cars and light trucks.
TRUSTED LEGACY SINCE 1979 - Red Line’s proven formula delivers uncompromising performance and protection.
DOUBLE THE COOLING EFFICIENCY - Boosts heat transfer by doubling water’s wetting ability for peak engine performance.
ULTIMATE RUST CORROSION SHIELD - Protects your cooling system even when using straight water or reduced antifreeze levels.

Red Line 80204 WaterWetter is a high-performance coolant additive that doubles water’s wetting ability to improve heat transfer, protects against rust and corrosion, and is compatible with all major antifreeze types. One 12-ounce bottle treats up to 5 gallons of coolant, making it ideal for passenger cars and light trucks. Trusted since 1979, it’s the go-to choice for professionals and enthusiasts seeking reliable engine cooling and longevity.

Specifications

ASIN	B000T9TNE6
Best Sellers Rank	#32,933 in Automotive ( See Top 100 in Automotive ) #101 in Antifreezes & Coolants
Brand	Red Line
Customer Reviews	4.6 4.6 out of 5 stars (3,294)
Date First Available	February 1, 2010
Item Weight	11.75 pounds
Item model number	80204 CASE/12
Manufacturer	Red Line
Manufacturer Part Number	80224
Model	80204
Product Dimensions	11 x 8.5 x 9.1 inches

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