I don't feel too bad about bumping this thread (beat me if I'm in the wrong) but I figured I could contribute.
I'm surprised by some of these posts and beating the keyboard with my face over others. I'm quite surprised that many of the dealers you guys are going to are splitting hairs or even bending the rules to exclude you from warranty work, but I under stand their logic. I'm not sure if many of you are aware of how the warranty process works from withing the dealer so I'll try to cover it briefly and simply.
Car comes in for warranty work. I'll say an O2 sensor for this example? So you come in because your CEL is on and the vehicle is under warranty. You pay nothing up front and the tech in the back gets to bring your car in, top off fluids, check the vehicle over (yes, kesooni, MOST should happily do this, free of charge, in the interest of customer satisfaction and the hopes of selling you something, be it an alignment, rotate, filters, etc.), then connect to the vehicle to scan codes and begin the diagnostic process. Everything up to this point is free of charge to you and makes the technician ZERO MONEY. No time is flagged for the technician as of yet. If he scans and finds an oddball code, he'll be going through the service manual and technical guides to check for voltage here, excessive wear there, or anything and documenting ALL of it for warranty purposes. If he sees a standard code that points to O2 sensor replacement in the manual, the O2 sensor is replaced. The technician flags the warranty time for the O2 sensor. Please note, warranty time is ALWAYS less than customer pay. Customer pay is usually/about warranty time X 1.5. No time is flagged for anything else, any diag, any other checks. The O2 sensor is paid for by the dealership, and the dealership pays the technician (in the form of time on their paycheck) for the work he did. The old O2 sensor along with the paperwork documenting the diag process and how the O2 sensor was determined to be at fault is sent away to corporate headquarters for evaluation. They check all documentation for correct diag process and any mention of ANYTHING that could have caused the part to fail at the fault of the customer. They then test the 'failed' part to ensure that it is in fact faulty. If it is not, then they start probing. Assuming the part is bad, and nothing throws a red flag, then the reimburse the dealership for the part cost and the time paid to the technician.
If the dealership sent back an O2 sensor that shows any signs of being messed with or damaged, such as a nick on it from you banging it on something while installing that aftermarket exhaust, or wires show signs of overheating or even melting, the warranty claim is kicked back an the dealership is left footing the bill and lost time for the repair.
I'm not saying anyone here is right or wrong, but just trying to provide a clearer picture of both sides. This is why the dealership doesn't want to warranty the transmission on your supercharged vehicle. While the transmission didn't throw a gear down the road, the dealership cannot know that the trans wont be torn apart went sent away and evidence of greatly increased stress. Yes, they will be tearing down that tranny, looking at every single surface, and measuring everything. These people are trained beyond belief to do just this. All day. Every day. This is EXACTLY what they do and they are incredibly good at it.
Just something to think about when you see the scratch on your mirror from where you banged it in that tight parking space and try telling the dealer that you don't think you hit it hard enough to cause the power adjustable mirror on that side to quit working.