The motor was filled with Corrosion X a few months ago and layer in a card box.
I took it recently, and there was a greasy stain under the motor. The leak is located where the wires exit the engine.
In addition, the liquid had soaked into the wires and was even on the terminals!
When I resoldered the terminals, liquid flowed onto the terminals from the wires (120cm length), boiled and smoked with a characteristic Corrosion X smell.
Corrosion X can damage some seals and silicone of they soak in it. You should have left it in a day and then drained the motor. A thin coating would have remained inside without the seal issue.
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I also have this, the CorX can go along the copper in the wire and also diffuse through the silicone of the cable slowly
But I am not sure if this is a problem?
Means the cable also is protected and the CorX, for me, helped soldering better than any flux I have ever tried 
But I could not observe any damage to seals or the cables since I filled it, also not in my “scientific” comparison I did between CorX, mineral oil and no oil
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