Only a guess:
Head gasket blown. Or cylinder bore and piston rings worn allowing oil past into the combustion chamber where it burns off an produces white or blue smoke at the exhaust. Water will leak into the cylinder if the gasket has blown.
Meanwhile for answers from mechanics, i'm not one, put your question in the cars section at bottom of forum as no CD/Radio system I've encountered has a cylinder or needs oil.
BB, March 2011