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Synthetic vs Organic

In message <199706290617.QAA23041@morden.netpci.com> "Mark&Michelle Sousa" writes:

> Recently I've made two oil changes Using Mobil 10/40 synthetic
> motor oil, scince then I've noticed an engine clattering sound when I
> first start the car upand let it idle, it eventually goes away when the
> engine
> warms up, but you can still faintly hear the clatter when idling, ...

It's probably lifter noise.  Run the engine for two minutes at 2500 rpm and
then let it idle.  If there's no noise at first, stop worrying.  If you let the 
engine idle for a while, the noise will eventually return.  

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club