>Looking for advice on which fuel stabilizer to use for overwinter storage. We use our boat throughout the winter, winds permitting, so we do not "winterize" our boat. But since acquiring our boat ten years ago we have adhered to the advice of our diesel shop and use two additives in the fuel.. One is the Biobor you mention. The other is Select-3 made by Hammonds, the same people who make Biobor. We use the Select-3 primarily for its Mil-Spec lubricity attributes but I believe it also has stabilizing properties as well. You can check out the specs and claims for their products at http://www.hammondscos.com/index.asp . According to the directions both Biobor and Select-3 (and I would assume any other fuel additive) need to be put in the tank first and then the fuel put in on top of them to ensure proper and thorough mixing. I don't know if mixing would occur eventually on its own if you simply pour the stuff into an already-full tank but I wouldn't trust that method to do as good a job as putting the fuel in after the additives are poured in. ______________________________ C. Marin Faure GB36-403 "La Perouse" Bellingham, Washington