The car should be viewed in the light in dry weather and be easily accessible all around. If the car is in a hall, it must be well lit. Wet vehicles make it difficult to see repaired parts and paint damage. Rust lurks in hidden corners such as wheel arches, trunk and under carpets. Musty smell in the interior indicates moisture in the car. After you opt for one of the used cars for sale online, if possible, look under the car as well. Oil stains on the floor are an alarm signal. What else do you think is important to do when buying a used car?