One of the most important, but most neglected aspects of car maintenance is remembering to get the oil in your car changed regularly. How often you need to change your oil has a lot to do with how often you drive your car and what type of oil your use, but on average, it should be changed every 5 months or every 5,000 miles; whichever comes first. While some people neglect their oil changes because they forget, others incorrectly believe that waiting to change their oil and getting fewer changes per year saves them money. In fact, the opposite is true. Waiting too long between oil changes can seriously accelerate engine wear, and drain the life expectancy of your vehicle, costing you big time down the line.