A light tapping noise is quiet normal .Use a flushing oil before you change the oil and filter.then use 10/40 semi synthetic(as recc by VW)when engines at operating temp run at 3500 fo 30 secs,this will "charge" the hydraulic tappets,a cold engine has a valve rattle for about 15/20 secs but if longer then cam followers faulty.normally at 120,000m(roughly)
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