Synthetic vs Organic

["Mark&Michelle Sousa" <mps@netpci.com>]

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, the
problem
is I'm not sure if this was occuring when I was using regular oil, should
I go back to regular or stay synthetic? Is this clatter normal for the
5cyl?
or do I have a serious engine problem?


Mark