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.

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Red Line 80204 Water Wester, 12 oz (355 ml)

Red Line 80204 Water Wester, 12 oz (355 ml)

Product ID: 733386434

Details

Brand
Red Line
Item Weight
340 Grams
Liquid Volume
0.34 Liters
Material
Aluminum
Package Information
Bottle

💧2.5x heat conductivity

⚙️12oz per 12-16L coolant

❄️30% LLC antifreeze mix

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€ 4613.76

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay cool, stay ahead — Red Line Water Wetter keeps your engine in the fast lane!

LOW VISCOSITY POWER - Flows effortlessly through radiators, maximizing cooling without clogging.
CORROSION RUST DEFENSE - Advanced agents guard your system, extending engine life and reliability.
PRECISION DOSAGE FORMULA - Optimized 12oz per 12-16L ensures perfect balance for peak performance.
SEASON READY VERSATILITY - Tailor your mix with 30% LLC antifreeze for winter-ready protection.
SUPERCHARGED COOLING EFFICIENCY - Boost your engine’s chill with 2.5x better heat transfer than standard coolants.

Red Line Water Wetter is a high-performance coolant additive that enhances heat conductivity by over 2.5 times compared to conventional fluids. Designed for precision use at 12oz per 12-16L of coolant, it improves cooling efficiency while protecting against rust and corrosion. Ideal for seasonal adjustments, it mixes with up to 30% LLC antifreeze for winter durability, making it a must-have for proactive vehicle maintenance.

Specifications

ASIN	B000CPI5ZK
Amazon Bestseller	#222,351 in Automotive ( See Top 100 in Automotive ) #1,092 in Motor Oils
Brand Name	Red Line
Container Type	Bottle
Customer Reviews	4.6 4.6 out of 5 stars (3,045)
Flash Point	149 Degrees Celsius
Global Trade Identification Number	00083522802048
Included Components	Red Line (80204) Water Wet - Coolant Additive - 12oz Bottle
Item Weight	340 Grams
Liquid Volume	0.34 Liters
Manufacturer	レッドライン
Material	Aluminum
Model Number	RED80204
Part Number	80204
Recommended Uses For Product	home
Specific Uses For Product	Temp
UPC	083522802048 172303062310
Upper Temperature Rating	60 Degrees Celsius

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