Some quick change oil shops push for oil changes every 3,000 miles, but modern engines have intervals ranging from 5,000 to 15,000 miles, and some even have oil sensors that tell you when the oil needs to be changed. Go by the recommendations of the manufacturer in your owner’s manual, not the shop. What to Read Next. Oil Change Coupons List “Don’t get talked into too-often oil changes. Follow the manual and your car’s engine should stay well-lubricated and perform well.” Over the course of two years and 30,000 miles, assuming that your oil change costs $40 a pop, you could save $240 if you get it changed every 7,500 miles vs. every 3,000 miles. Plus, an oil change is the most important task you can do to make your engine last. We’ll teach you how to change oil and how to extend oil life. Changing oil isn’t brain surgery—you probably did it yourself years ago. But with oil change shops charging more and more, it’s time to get back under the car and start saving big bucks.