i bought a new car in july from chevy, i remember the guy telling me for rather the first 2 or 3 yrs I get all of my oil changes and tire rotation type services done free at the dealership. I cant find the exact paper work off hand as I have filed it away, my question is, when i bring my car in should i tip any of them for the work they do? if so, who should i give it to? also am i already possibly paying for these services as they were built into the sales price?