1999 have spark plug tubes that tend to leak as they get older, similar to oil return tubes on air cooled engines. Your third picture appears to be a leaking tube. Check them all you will see oil pooling in the tubes if they are leaking. You were going to do plugs anyway right? Get an expandable boat plug to take them out. Be careful they get brittle and can break if you are rough with them.
http://www.pelicanparts.com/cgi-bin/ksearch/PEL_search_2016.cgi?command=DWsearch&description=Spark+Plug+Tube+
http://www.discountmarinesupplies.com/Drains_Plugs-Seachoice_Twist_Lock_Drain_Plugs.html?gclid=COS8gb WFvtECFVWHswod_IMOkQ
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
Last edited by FPB111; 01-12-2017 at 05:14 PM..
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