Hi guys, i know this kind of a noob question, but i havent serviced the car for a while and its got 92k on it. Now my engine maintenance flashed a few times after the car has started and then turns off. I asked the dealer and the guys just said that its time to take it in for service. I asked him what the service includes and most of the things were stupid oil change and what not but the one that i didint know is valve adjustment. Do you guys know what that it, and what it does for the car. Like if i dont do it, is there a chance that i will mess something up or is there any way of knowing if i need the valve adjustment or not. And have any of you guys done the valve adjustment, do you know how much it costs? Thanks