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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💧 Stay Cool, Drive Confident: The Secret Weapon for Peak Engine Performance

NO ASSEMBLY NEEDED - Just add to your coolant system and feel the difference instantly.
TRUSTED BRAND QUALITY - From Red Line Oil, a name synonymous with performance and reliability.
COMPACT READY TO USE - 12 oz bottle designed for easy pouring and precise dosing.
ULTIMATE COOLING BOOST - Slash engine heat and protect your ride from overheating.
UNIVERSAL COMPATIBILITY - Works seamlessly with all water-based cooling systems for hassle-free use.

Red Line Oil 80204 Water Wetter is a 12 oz additive designed to reduce engine operating temperatures by improving coolant efficiency. Compatible with all water-based cooling systems, this trusted product from Red Line Oil helps prevent overheating and enhances overall engine performance without any assembly required.

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Brand	Red Line
Power Source	Corded Electric
Connectivity Technology	Wi-Fi
Style	Modern
Colour	Red
Are Batteries Included	No
Item Weight	340 Grams
Manufacturer	Red Line Oil
Shape	cylindrical
Global Trade Identification Number	00083522802048
UPC	083522802048 172303062310
Product Dimensions	27.94 x 22.86 x 21.59 cm; 340 g
Item model number	RED80204
Manufacturer Part Number	80204
OEM Part Number	80204
Volume	12 Fluid Ounces
Assembly Required	No
Country of Origin	USA
Item Weight	340 g

Red Line Oil 80204 Water Wetter - 12 oz

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