human
I've heard that I should get my car's oil changed every 3,000 miles or so. What does this mean, and why is it important?
assistant
That’s a good rule of thumb for most cars. It’s based on the fact that an oil change typically costs around $30 to $50, depending on your vehicle. The oil in your engine needs to be changed periodically because as you drive, the oil breaks down and becomes contaminated with dirt and other particles. If you don’t change your oil regularly, then your engine can become less efficient, which can lead to higher fuel bills and lower performance.