<human>:  How do I know when my car needs an oil change?
<bot>: The best way to know when your car needs an oil change is to refer to your car's owner's manual for the specific maintenance schedule recommended by the manufacturer. Most manufacturers recommend changing the oil every 5,000 to 7,500 miles or every six months, whichever comes first. You should also regularly check your oil levels, and if they appear too low or dirty, it's time for an oil change.