I bought another car recently, and the finance guy was giving me a line of bull, saying I had to buy their fucking maintenance package or my warranty would be void immediately.
I made that mistake once. And by mistake, I mean that I bought the car after getting a line of bull from the finance guy. Now, if I get a line of bull from the finance person, I don't buy the car from that dealer. I also make sure the sales person knows why they just lost a commission.