With today being very cold and the furnace about to run a lot, I realized that the electric motor that runs the burner in my oil furnace hadn't been oiled in a year. I remember in years past having asked the furnace-maintenance guy if it was okay to use 3-in-1 Multipurpose Household oil in the burner's oil cup. He'd said it was okay. So that's what I put in, about 8 drops. (The can must be 10 years old so any volatile ingredients might have evaporated.)
Then I did some online research and have read that is not okay to use that. So I went to Lowes and got 3-in-1 Motor Oil SAE 20. Can I put that in to flush out the Household oil with the penetrant that's in the Household oil? Is this a big problem, or am I worried for nothing?
Is it possible to put too much oil into that hole for the oil cup and cause damage somehow?