On Sat, 13 Jul 2019 12:48:21 +0100, "Jim GM4DHJ ..."
wrote:

should oil be coming out of the drain hole of the tank of a new
compressor when you unscrew it after use......thought it should only be
water???

If it's new you might be loosing some oil past the rings (assuming an
oiled piston compressor), till it runs in?

Or it could be the residue of any protective oil from the inside of
the tank? shrug

Or it might be broken and you are trying to run a big single cylinder,
one-shot diesel? ;-)

Cheers, T i m