Not knowing the chemical make up for Stabil but don't think it has a biocide and is more for gasoline which degrades relatively quickly compared to diesel
. If it were me, would add Biobor or some other additive with a biocide.
Bacteria growth is not a great problem in your arctic conditions but bacteria will build up. Started treating the 25 gallons diesel
tank with Biobor a couple of years before leaving for Hawaii
from SF. Tank was more than 40 years old and Biobor was not among various cans of stuff that came with the boat. Racor
500 filter was totally clogged after I reached Hawaii
. Had to disassemble it and scrub out the yogurt consistency junk that had been stirred up and ingested. Put a lot of hours on the engine
because I had to turn back the first time and power 200 miles to SF. Didn't check the filter but thinking back on it, filter bowl was a little cloudy before leaving the first time. In short, change your filter after adding Biobor and before you leave for a cruise
. Probably would help to take the boat out in some challenging weather
to shake the tank up before changing the filter or have the fuel
polished if the engine
hasn't been run much.