I have a gallon of blue thunder thats been sitting around for about 6 months (itsonly 6 months old too). It had the air tight cap on it too. I just opened it up and it smells funny to me. It may be that I just havnt smelled nitro fuel in a while, but it smell alot more like alcohol than i remember, like rubbing alcohol. Does this sound ok? Also, if it was bad, could it damage my engine?