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Message: <blockquote data-quote="radler2560" data-source="post: 28238" data-attributes="member: 5214">I bought my 2011 2.4 new.  GM had a customer satisfaction programs to 1) replace the defective piston rings and new pistons, 2) the cat, which became clogged due to the motor oil by passing the pistons rings into the exhaust manifold.  Any GM dealer can check the GM computer to verify the repairs.  You can also check NSHTA for the appropriate bulletins.   I have 177,000 miles and it doesn't burn a drop of oil.Good luck</blockquote>