Latest news there is a recall on the 2.7L and 3.0L Nano Engines...
What the $hit. Dealers are going to run some test on them and replace engines as required...
This is nothing new...The 3.0L Continentals also have valve issues...
Next class action will be the rubber belts we have running in the engine oil... if you are unsure of this just gander over to Youtube and watch some engine teardown videos... Some are just for oil pumps and others are entire valvetrain... GM does it too..
Change you oil often... and change your wet belts at great expense.