Good Vibrations

#1
Unlike the Beach Boys song - my vibrations might not be so good ? I've had a 2013 S model(manual transmission) since it was less than six months old. Over the past several months the idle speed has worked it's way down to 600rpm. At what point does oil starvation occur ?
 
#2
At what point does (a lack of any response) starvation occur ? The idle gets down to about 600rpm after it's warmed up. Does allowing it to idle that low for any length of time(be it for several minutes, or even at a stop light ?) pose any risk ?
 
#3
The sounds of silence. An old Simon and Garfunkel song. It also seems to be a common tune heard on this site. Lack of interest? Maybe some think a lack of substance by those starting a thread?
 
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