In a sealed container, kerosene stays good for a really long time (multiple years). The one problem it might have is absorbing water, so it should be filtered.
If they're in sealed, UV-proof containers, ethanol and methanol last just about forever as far as I'm aware. Again, absorbing atmospheric water is a potential problem.
The National Biodiesel Board recommends using biodiesel within 6 months of when it's refined. I've seen suggestions that that's a worst-case scenario for hot, humid environments and it'll last longer in cold, dry environments, but I haven't seen numbers.
Kerosene and the alcohols are most likely to be spoiled by water, so either a water-absorbent filter or (for the alcohols) re-distilling should get them back to normal. Biodiesel and petro fuels I'm not familiar with any restoration techniques.
__________________
The poster formerly known as The Dark
The Vespers War - Ninety years before the Twilight War, there was the Vespers War.
|