Ive never heard of it? I just make sure to never get below like 1/3 tank in the winter. Its been everywhere from 0 to -30 the last week and I havent had any troubles(where is the knock on wood emoticon?)
Are you talking about the stuff you pour in to get rid of moisture in your fuel? If so i never use the stuff. I live near Chicago and it has been -30 windchill the last couple of days and I only had 1/4 tank of gas. No problems at all. As long as you know that you are getting good gas at the station (no water) then you should be ok.