The three most important trade-in car tips are just common sense. The first is to make sure you do your homework by studying your driving habits and knowing the vehicles that will meet them. The second is to remember that the dealer will try to hit you on monthly payments, and keep at it so they can maximize their profit, while you must keep your eye on the price. Finally, the best tip you can have is never speak first, because as they say in the car business ,“He who speaks first, loses!” And it is very true, as is the maxim, that you never bring your credit card with you or at least let them know you have it.