How Often Should You Change Your Oil?
With full synthetic oil, most modern cars can go 7,500–10,000 miles between oil changes — some up to 15,000. Conventional oil needs changing every 3,000–5,000 miles. And regardless of mileage, change your oil at least once a year, because oil degrades even in a parked car.
Oil change intervals by oil type
| Oil type | Typical interval | Time limit |
|---|---|---|
| Conventional | 3,000–5,000 miles | 6–12 months |
| Synthetic blend | 5,000–7,500 miles | 12 months |
| Full synthetic | 7,500–10,000 miles | 12 months |
| Extended-life synthetic | 10,000–15,000 miles | 12 months |
Always defer to your owner's manual — it lists the interval and oil specification your engine was designed for.
When to cut the interval in half
Oil wears out faster under stress. If most of your driving looks like the list below, change your oil roughly twice as often as the label suggests:
- Frequent short trips where the engine never fully warms up
- Stop-and-go city traffic
- Towing, hauling or roof loads
- Very hot, very cold or dusty conditions
The 3,000-mile rule is dead
The "every 3,000 miles" advice comes from the era of conventional oil and carbureted engines. Modern synthetics and tighter engine tolerances stretched intervals dramatically — changing synthetic oil at 3,000 miles mostly just costs you money. The quick-lube sticker on your windshield is a sales tool, not your manual.
The real problem: remembering
Almost nobody forgets how to change oil — they forget when they last did it, what oil went in, and what mileage the car was at. That's exactly what an oil change tracker solves. With ServiceLog:
- Log the oil change in seconds — date, mileage, cost, and the exact oil type and grade you used, so the next one is never a guess.
- Attach the receipt from the shop, or your parts receipt if you DIY.
- Set an oil change reminder so your iPhone notifies you when the next change is due — even if it's a year away.
- See your full oil history at a glance: every change, every brand, every interval, for each of your vehicles.
Frequently asked questions
Is the 3,000-mile oil change rule still true?
No — it dates from the conventional-oil era. Modern engines on synthetic oil typically go 7,500–10,000+ miles. Follow your owner's manual, not the quick-lube sticker.
Does oil go bad if I barely drive?
Yes. Oil oxidizes and collects moisture even while the car sits, so change it at least once a year regardless of mileage — a date-based reminder covers this case.
How do I know which oil my car takes?
Your owner's manual lists the viscosity grade (like 0W-20) and specification. Log the oil type with each change in ServiceLog so you never have to look it up twice.