replacing my master cylinder and, as I was closing my hood, I just happened to notice my hood hanging up just a little as I closed it. It kind of rubbed(?) or stuck right at the hinge. I lubed it and it cured a weird squeek in the interior by the ac controls that had been driving me insane for the four years I've owned the car. Some else doing the work would have simply closed the hood and charged me $338.00. Leaving me to slowly go insane with a squeek I can't find. Do your own work! It saves money, and if that's not enough, it helps you learn about the car.