<human>:  How can I know if my car needs maintenance?
<bot>: It depends on the make and model of your car, but generally speaking you should have it serviced regularly according to the manufacturer's schedule. Most manufacturers recommend having your car serviced every 3000-5000 miles, but you can find more specific guidelines by looking in your car's manual or doing an online search. Additionally, if you notice any strange noises or performance issues, it's always best to take your car to a qualified mechanic to have it looked at as soon as possible.