The provided source outlines ten critical factors that determine a vehicle's resale value, which affects the financial return when an owner sells or trades their car. These factors include elements within an owner's control, such as vehicle condition and maintenance records, and external elements, such as the brand and model reputation and current market demand. The episode explains that cars with strong reputations for reliability (like Toyota or Honda), low mileage, clean accident histories, and neutral colors tend to retain their value better than others. Furthermore, economic and industry trends, including fuel prices and technological advancements, also play a significant role in influencing consumer preferences and overall resale prices. The source concludes by offering practical tips for owners to maximize their car's value, emphasizing regular upkeep and strategic timing of the sale.