Took my car to the dealer with bad pre-ignition in 2010, they kept for two 1/2 weeks. They never could figure out the problem. Had been told by mechanics that this problem would eventually ruin the engine. It did ruin the engine and had to replaced. That engine also went bad and here I am with the third engine installed in the car earlier in 2011 and now it's 2012 have had the car in the Dealership for three weeks and they can't fix a problem where the car starts sometimes and sometimes it doesn't. and that is after them replacing the computer, cam sensor, crankshaft sensor and they still do not know what the problem is!!!!!!!!!!!!!!!!!!!!