I think kero can only be stored outside. I might be wrong on this though.
With oil you have a choice but only for a summer use system since the oil could gel as suggested above. I think the temp has to get somewhere around zero for that to happen but again I'm not sure. There are additives that will lower the problem zone but they have to be added shortly before the tank is filled for proper mixing.
If a more knowledgable member does not weigh in you should check with a fuel supplier for those facts if they're relevant to your decision.
Good luck!
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