For most car owners, it is important for them to keep their vehicle in perfect condition to maximize the value at trade in time. Maintaining your vehicle adds up to the value on trade or sale by private seller. For those who want to know the value of their vehicle, there are a few things that needs to be understood. First, you have to know detailed information of your vehicle, such as the vehicle model, year, mileage and any added features installed. Once you have all these, go online and find reliable trade in value calculators for vehicles such as the sites like ours that uses Black Book values. You can also check with car dealers about the value of vehicles with the same model by searching for comparable vehicles listed online. With this information, you can determine how much you can sell your automobile.