When to change engine oil: miles or months?
The answer is whichever comes first. Drive a lot and the mileage arrives first; drive a little and the calendar does. Oil oxidizes and collects moisture over time even when the car sits. Your owner's manual is the authority — the numbers below are typical ranges.
Typical oil change intervals
Intervals vary by maker, engine and oil type, so check the manual first.
| Driving | Distance | Time |
|---|---|---|
| Normal (synthetic) | 5,000–10,000 mi | 6–12 months |
| Severe (short trips, stop-and-go, towing) | 3,000–5,000 mi | 6 months |
| Low-mileage car | — | 12 months even if miles aren't reached |
Are you a severe-service driver?
Short commutes, heavy traffic, dusty roads, extended idling and towing all count as severe service. Many city drivers qualify, so the severe-service schedule in your manual is often the safer choice.
Other items worth tracking
- Tire rotation: about every 5,000–7,500 mi
- Engine air filter: about 15,000–30,000 mi or yearly
- State inspection: per your state's schedule
- Insurance: every renewal date
Try it with Fillnote
Fillnote lets you set each service by distance, by date, or both, and shows whichever comes first — like "Engine oil 770 mi left" — on the home screen. Odometer readings from your fill-ups keep the countdown current, and you're only notified when a service is close.
See miles left until your next oil change
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