Noisey Lifters on Coupe GT after Oil Change

[Glenn Kaufman <gkaufman@ftp.com>]

I just got my Coupe back from the dealer.  They did an oil change and the
lifters are noisier than they ever were.  It took a long time for that rap
tap tap to disappear.   The Audi rep says that he noticed it, and therefore
he had added a few drops of Bardol (?) oil and said that it should help.  In
the past, I've noticed the noisy lifters for about 30 seconds upon start-up
but never like this.  The oil they put in was Valvoline 20W50.  For the past
30K miles, I've used the Valvoline semi-synthetic ranging from 20W50 to 10W30.

Can anyone comment on what's happened, any remedies, and should I worry
about it?  Thx.  glenn