7. Spark Plugs
A common component to keeping your car running healthy and efficiently is a fresh set of spark plugs. 1.5 percent of owners indicated the need to change their spark plugs in the 2013 Vehicle Dependability Study, which was an improvement of 0.3 percent over last year. If you care about your vehicle though, spending a few bucks on a new set of plugs before three years is a great way to maintain a long-term relationship with your car.