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diesel life and winterizing
I bought my boat used about a year ago, and the diesel tank was about 3/4 full. I have no idea how old the fuel is, but I'm guessing a year and a half. When I winterized last winter I put the standard treatment with biocide in it.
Now I'm down to a 1/4 tank and apporaching the winter. For considerations of fuel age, bacteria growth, condensation, etc, should I leave as is (adding treatment) and fill in the spring, fill now (and treat), drain and refill? Or is this even a big deal?