Audi A6 1.8T Ticking noise from engine

HI MY 1999 A6 1.8T SE makes a ticking noise for the 1st 3 minuits after starting up after that it is fine it gets louder when I accelarate . the oil was changed 3000 mls ago by an Audi dealer. also
would the 19inch Alloys off the new A8 fit on the A6 as they look great.
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