Car maintenance runs on two clocks at once. Some things wear out with distance, like oil and tires. Others age with time whether you drive or not, like brake fluid and wiper blades. That's why most service intervals read "every X miles or Y months, whichever comes first."
The ranges below are typical for modern cars. Your owner's manual has the real schedule for your engine, and it always wins. If you tow, drive in dusty places, or make lots of short trips, use the "severe service" schedule in the manual, which is shorter.
Regular services
| Service | Typical interval | Notes |
|---|---|---|
| Engine oil and filter | 5,000 to 10,000 miles, or 6 to 12 months | Full synthetic usually goes longer. Follow the manual or the car's oil-life monitor. |
| Tire rotation | 5,000 to 7,500 miles | Often done with the oil change. Evens out tread wear. |
| Tire pressure | Monthly | Check when the tires are cold. The right pressure is on the driver's door jamb sticker. |
| Wiper blades | 6 to 12 months | Replace when they streak or chatter. |
| Cabin air filter | 15,000 to 25,000 miles, or yearly | Sooner in dusty areas or if airflow from the vents drops. |
| Engine air filter | 15,000 to 30,000 miles | Check it at each oil change. Dusty roads shorten its life. |
Longer-interval services
| Service | Typical interval | Notes |
|---|---|---|
| Brake fluid | Every 2 to 3 years | It absorbs moisture over time, which is why this one is by time, not mileage. |
| Brake pads and rotors | Inspect at every tire rotation | Pad life varies a lot with driving style. Replace by measured thickness, not by mileage. |
| Battery | Test yearly once it's 3 years old | Most last 3 to 5 years. Heat shortens battery life. |
| Coolant | Varies widely, per the manual | Long-life coolants can go 100,000 miles. Older types need changing much sooner. |
| Transmission fluid | Varies widely, per the manual | Often 30,000 to 60,000 miles for older automatics. Some newer ones go far longer. |
| Spark plugs | 30,000 to 100,000 miles | Depends on the plug type. Iridium plugs sit at the long end. |
| Tires | Replace at 2/32 inch of tread | Also replace by age. Many tire makers suggest replacing at six to ten years regardless of tread. |
Mileage or time: which one do I follow?
Whichever comes first. If the oil change is due every 5,000 miles or 6 months and you've only driven 2,000 miles in half a year, it's still due. Oil and fluids break down with age and short trips, not only distance.
This is where tracking gets awkward with a calendar alone. A calendar reminder knows about time but not about miles, and a sticker on the windshield knows about miles but nobody reads it.
Keep the receipts
A complete service history is worth real money when you sell the car, and it's what a warranty claim may ask for. Log the date, the mileage, what was done, and what it cost, and keep a photo of the receipt with it.
Common questions
How often should I change my oil?
Most modern cars call for an oil change every 5,000 to 10,000 miles or every 6 to 12 months, whichever comes first. Full synthetic oil usually sits at the longer end. Your owner's manual or the car's oil-life monitor has the exact figure.
How often should tires be rotated?
Every 5,000 to 7,500 miles is typical. Many people do it at every oil change so they don't have to remember it separately.
Is car maintenance by mileage or by time?
Both. Most intervals are written as a mileage or a time, whichever comes first, because parts wear with distance and fluids age with time.