NEW YORK (CNNMoney.com) — In a car-buying transaction, even the nicest, most honest car salesman has interests that are very different from yours.

He’s paid to sell you what his dealership has at as large a profit as possible. The better he does that, the more he, and the dealereship, make.

You, on the other hand, want the best car you can get at the best price you can get.

Welcome to capitalism. At some point, you have to negotiate those conflicting interests. As in all negotiations, there are certain things you definitely shouldn’t let slip.

1. I love, love, love this car

2. I need to get a car by tomorrow

3. I need a monthly payment of…

for the other three, and more details, take the link below…