As you drive your vehicle, engine oil breaks down and wears out. When it does, it becomes less effective at lubricating the engine and absorbing heat. As an automobile owner, your goal is to change the oil in your car or truck before it breaks down and causes catastrophic engine failure. With that in mind, how often should you replace your oil? There are many factors to consider, including the way you drive, how old your engine is, what type of vehicle you operate, and where you live. Several mechanics will advise you to change your oil every 3,000 miles. Automobile manufacturers might suggest a longer period, such as 5,000 miles. If you you’ve upgraded to synthetic oil, you might be able to go 10,000 miles before changing the oil.