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Yes. And technically, you can put any liquid in an electric motor. If you disassemble it, a lot of small objects would fit inside as well.

As for the correct electric motor oil:

"Mineral oils are adequate for most electric motor bearing applications. However, synthetic base oils may be required for extreme temperature applications or where longer regreasing intervals are desired. The thickener primarily serves as a carrier for the oil and prevents it from leaking out of the application."

3 in 1. but they come in different colored labels. you'll have to poke around and see which one. They had the little tin at a dollar store near me.

Electric Motors take a special type of oil.

I would look up the model of the motor and try to find the manufacturer specs and see if they recommend oil type.

This link might help you. Transformer oil.
https://www.electrical4u.com/transformer-insulating-oil-and-types-of-transformer-oil/#:~:text=Transformer%20oil%20%28also%20known%20as%20insulating%20oil%29%20is,of%20the%20transformer%20%28i.e.%20act%20as%20a%20coolant%29.
I would check with an electric motor repair shop.