Illinois Car Loans : The first most important thing to be considered while applying for car loan is low interest rate. As rates depends upon a lot of factor, it is important to consider all and do some homework while applying for it. Factor like - type of car that is new or used is to be considered as the rates on used are little bit high than new car in Illinois including Chicago, Aurora, Rockford, Joliet, Naperville, Springfield, Decatur, Willowbrook, Sullivan, Oswego, Crystal Lake.