Maybe your old car deserves its place in your driveway. After all, thrift is a good thing. However, if you are trying to decide when to trade, here is a checklist to help you do a cost-benefit analysis.
Do you need tires? Do you need scheduled maintenance? Check with a dealer service department to get estimates. Add it all up. If you are getting into the thousands fairly quickly, you may want to cut your losses and use your car ‘as is’ for a trade.