I have one w/ 16k miles, found lots of issues on edmunds.com town-hall '10 'nox forum, here's my tale of woe.....

What started it all this evening (Sat 9pm 8/13/11), I was looking out the kitchen window & saw a bright red flashing light at the top of the dash (looked like the headlight sensor). Went out to the car & found the onstar buttons on the mirror lit up as well. Went & got the keys, started the engine & ran it thru a run/stop cycle, now the center console & steering wheel control lights won't go off either. Then the onstar started constantly beeping about 15 min latter (more on/off cycling had passed) & the radio won't come on now too. I came in to google & read forums for the issue & found a whole slew of things (ie. oil consumption) I checked & had to add almost 2 qts. This is new, as I still change my own oil & never had it use any between changes. As stated, only 16k miles, last oil chg was 12,700, barely over 3k. I had noticed the "average fuel economy" on the DIC has only been a little over 20mpg & didn't think much of it as my wife drives this 98% of the time & 95% of it is local + she can have a heavy foot. The black soot tells the story, I ran my finger thru it & it caked off on my finger. It was like (old school) driving around 3/4 choke all day soot. Calling the dealer Mon AM!

edmunds forum link http://townhall-talk.edmunds.com/WebX/.f1e117b/1045