I had my 2012 cx9 at the dealer for an oil change at 40,00 miles. The service tech. tried to sell me on what he called "Intake system cleaning". He said that the tube from the EGR valve gets dumped into #1 cylinder and causes carbon build up on the piston & valves. This seemed like a far fetched story to me so I declined. I'm not sure how much they would have charged for this, but bet it's not cheap. Anyone else ever heard of this? He also recommended a power steering oil change which seemed a little closer to reality. Again has anyone heard of this? I could not find either of these in the recommended maintenance.