Changing your oil is a necessity, not a luxury, and most automobile owner’s manuals recommend an oil change every 3,000 to 7,500 miles. The demands your vehicle puts on your engine’s oil are very unforgiving, and eventually, the oil loses its ability to lubricate, cool, clean and flow freely. In fact, not changing your oil regularly will substantially reduce your engine’s lifespan, and oil is much cheaper than steel.