<human>:  How do I know if my car needs an oil change?
<bot>: The best way to know if your car needs an oil change is to refer to your vehicle's owner manual and follow the manufacturer's recommended maintenance schedule. If you're due for an oil change, your car may also show signs such as engine warning lights, increased engine noise, or lower oil levels. It's best to have an oil change performed by a professional mechanic to ensure optimal performance of your vehicle.