A car is the second most expensive investment you will make in your lifetime. The first, of course, is a house. However, unlike a house, a car goes down in value instead of up. This can often make it feel like you're throwing money away every time you buy a new car. Unfortunately, a person will go through several cars in their lifetime. Avoiding getting a newer car can actually cost you more money in the long run. So how do you know if it's time to replace your car? There are several signs you should look for.