If you’re looking at used cars with someone else, have them start the used car while you stand behind it. You want to see what the car looks like on the outside when you start it. You’re looking for smoke from the exhaust pipe. If there is blue smoke, it usually means that the engine is pretty worn and may not last long. White smoke can often mean that there’s coolant leaking somewhere. If it is indeed coolant, you’ll also notice a burned, sweet smell. A little bit of water dripping from the tailpipe is normal, however.

After watching the vehicle start, walk around to the front. Pop the hood and look at the engine as it runs. There shouldn’t be any smoke or drips. You’ll also want to listen for any strange noises at this time, as you may not be able to hear them during a test drive.

With just a little bit of extra diligence, you can help protect yourself when buying a used car.