alot of the mk4 range suffer from a severe case of condensation in the oil cap area due to the nature of all the plastic engine covers, try checkin it after a 20mile run and see what it is like then, or remove the platic covers and etra filler neck and replace your oil cap directly onto the head, then have a run and see what its like?? ive had this on mine, 1st time i saw it i thought ohh fook, then read up it was a common prob, removed me plastics and put cap straight on head and all was well.
if your usig alot of oil/water or they are mixing that is a good indication of head gasket probs... tis hard to try and diagnose without having a look/test in the flesh!!
