There are many things that you don’t want to see a dealership do to you as a buyer, but there are some things that you should not do as well, if you don’t want to alienate the dealer.Here is a list of “don’ts” that you should abide by if you are really looking to get a good deal.• Don’t try to pull one over on the dealer by lying about the condition of your trade in vehicle. It is just a lie that you can’t get away with, and could cause many cost increases later. The dealer will find out about.