I know people use to immerse electronics in for cooling. I'd guess it would probably be okay, but don't do it based on my report alone.
People use it for cooling computers by immersing the whole thing in a fish tank. It's also used for cooling ignition coils and transformers. It would probably be OK for a brushless motor but I imagine you would have some output losses due to fluid dynamics/friction. I doubt it would be good for a brushed motor as the brushes create conductive dust as they wear.
Good points and it is brushed. Im going to spend the money and get the right oil.
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