As mentioned before mate im siding towards valve stem seal fitted incorrectly or a worn valve guide.Doing a compression check wont determine the oil control rings are fubarred as a leak down test is needed for this,and even then its not 100%I decided to pop a thermostat in the mk3 instead of doing the leakdown tst today as im waiting for my stethescope to come on monday.In my case because the piston was struck by a valve it could have pinched a ring or damaged a valve guide but i think you will be lucky and just need to whip the top off and i think you will find a damaged vsos.Take it to the garage that rebuilt your head and ask them to check their work while it is still running driveable.Regardless waht the problem is with her mk4 i will be stripping it down monday afternoon after i wake up from my sunday night shift.yea think il go give them a ring monday and say to them that since fitting the head (il tell them i did it beginning of the week) iv had this problem etc and say that iv taken it to a garage where they did a leak down test and compression test and both are fine, so its pointing towards the vsos.oil is getting on to my spark plugs now and causing a misfire if the engine gets fixed then its still coming out inplace of a 20v... i can ust get a bit more money for it then on the good old bay!Dont loose hope with it just yet
