I haven't started my 30 y.o. Ford-NH 2910 all summer, since I bush-hogged the roadside. Today it is at least supposed to not rain, so I intend to start the tractor, change the tool to the (snow) plow blade and put the tire chains on. They weigh 60 pounds each, so tomorrow I'll be bent over stove in.
But the cautions for my heater system are full of warnings to not use starting fluid for the intake heater.