I have been doing a lot of research on purchasing an outback the last few months. I originally was considering purchasing new, or a 2010 or newer model. I ruled out the 2010-2011 because of the potential steering wheel shake issue. I have started looking at the 2005-2009 model years, and have read of the head gasket issues, which brings me to my question. How common is head gasket failure in the 2005-2009 outbacks? Is it something that would shy you away from the purchase of a 2009 Outback?