Hi, looking for some advice. My '78 will be stored in an unheated barn, so in Maine the temps inside can be chilly to say the least. So, Should the gas tank be left: nearly empty, half full, almost full. I have seen definitive opinions on each option. Also, what is the recommendation re: using fogging oil spray in the cylinders.

Thanks, Larry

 

Fuel tanks should always be as full as possible. The more air in them, the more they breathe, which brings in humidity, which condenses in the tank. And because it sinks below the gas, the water never evaporates back out - only the gas does.

Fogging the cylinders isn't necessary. I've let engines sit unused for several years (not in Maine weather) with no problems. The caption of this photo contains Ford's recommendations for (mainly NEW) vehicle storage:

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Additionally, I'd be VERY concerned about coolant maintenance (something most people ignore), brake fluid, and a battery maintainer of some kind (at least solar, if not a BatteryTender Jr.).

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This size can sometimes be found at HarborFreight or NorthernTool for ~$10~16.

 

What I have done for 30+ years is to fill the fuel tanks and put Stabil in the proper quantity in them just before I fill up the tanks for the last time. Change oil if it is close due. If any other fluids are due for a change, do it. If they are not due, no need.Any auto which has a heater control valve, run the heat full for a short time to get the coolant flowing. Most will have blend doors and the coolant is constantly flowing, so no action is needed. I fill the tires to their maximum pressure as shown on the sidewall. Put a battery maintainer on the battery and you are good to go. Do not periodically start the engine to let idle in the driveway. You are better off just to let it sit unless you can do a 10+ mile drive on the road.I usually put them to sleep in early November, never start them up until later in April.