Compressor question-
My compressor has been stored in the cellar over the winter with the valve open. Each time i finish using it i open the valve and blow out any moisture , and again before i use it next time. This time as i blew it out i tilted the tank to be sure i got all the moisture out. Out came a small pool of a grey/brown liquid. Checked the oil level, and it was fine. Any ideas of what it could be??
Thanks.
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