If you are in the market for a used car loan, be prepared to negotiate a good deal. Initially, car salesmen try and convince prospective buyers to agree to a huge sales price and interest rate. Of course, this maneuver does not serve to your advantage. Instead, it boosts the dealerships profit margin. If you have good credit, you are in a position to negotiate a better deal. However, if you have a low credit score, here are a few ...