I have some oil (or something) weeping from the junction of the valve cover vent to the Air/Idle system. It isn't dripping out but it is noticable and it seemed like it started a month ago. Anything to worry about? Any suggestions?

Steve
'85 500SL Euro

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si