I've done it both ways. Most years I just run a little rv antifreeze through it. I would like to say it worked great. However my first washer lasted only 5 years and the second one lasted a little better than a year. We're going to see if sears replaces or repairs it, or tells me to shove it. lol.
Hey it's up to you, but as I said, the oldest PW I own has been running strong for 11 seasons, it lives in an unheated shed at my second home. I have used the winterizer every year. The stuff works great.
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