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 Water Wetter Coolant Additives 12 Pk Case

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Description

🔥 Stay cool, race ready, and corrosion-free with Red Line Water Wetter!

UNIVERSAL COMPATIBILITY - Works seamlessly with ethylene, propylene glycol, and all modern antifreezes.
RUST CORROSION DEFENSE - Safeguards aluminum, cast iron, copper, and brass cooling systems—even with straight water.
RACE PROVEN COOLING BOOST - Cut engine temps by 30°F for peak performance and reliability.
TRUSTED LEGACY SINCE 1979 - Engineered by racing enthusiasts for uncompromising heat transfer and protection.
PRECISION DOSAGE FLEXIBILITY - One bottle treats up to 5 gallons; scalable for any vehicle size or system.

Red Line Water Wetter is a cutting-edge cooling system additive that reduces engine temperatures by up to 30°F while providing superior rust and corrosion protection. Compatible with all antifreeze types and designed for modern metals, it enhances heat transfer efficiency for both racing and everyday vehicles. Trusted since 1979, this product delivers proven performance gains and reliable protection in a convenient 12 oz bottle.

Specifications

ASIN	B000T9TNE6
Best Sellers Rank	464,950 in Automotive ( See Top 100 in Automotive ) 832 in Antifreeze & Coolants
Brand	Red Line
Customer Reviews	4.7 4.7 out of 5 stars (19)
Date First Available	1 Feb. 2010
Guaranteed software updates until	unknown
Item Weight	5.33 kg
Item model number	80204 CASE/12
Manufacturer	Red Line
Manufacturer part number	80224
Model	80204
Product Dimensions	27.94 x 21.59 x 23.11 cm; 5.33 kg

Reviews

S**A

Yes it WORKS....

Used two bottles in my 2009 Peterbilt. It took a little while to throughly mix since I poured them in the reservoir. I can absolutely state that the water temperature lowered an average of 6 degrees and the engine oil by 12. I do not believe it could be any better.

11.10.2024

A**R

Great product!

Water Wetter works as advertised. Engine temperature remains constant even on a hot humid day here in Manila.

11.04.2010

M**N

Five Stars

Great purchase !

14.05.2015

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