I have a Troy Built 2600 PSI with Honda engine. Never used anti-freeze in it nor remember reading to do so. I do start it every 4 weeks to keep from having trouble with gummed up carburetor due to the Ethanol in the gas. I also use Sta-bile in the gas for Ethanol. I had a generator that I didn't start for about 2 months, then I couldn't get it started. Costs me $100 to get the thing started and the tech told me to start every month and run it for 10 to 15 minutes. I believe I bought mine at Lowes.
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Les
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