Oil change interval calculator
How Often Should You Actually Change Your Oil?
Forget the "every 3,000 miles" myth. Modern oils and modern engines let most cars go much longer between changes — but only if you know which interval applies to your driving.
Always defer to your owner's manual if it gives a number. Manufacturer intervals account for oil capacity, engine design, and the specific oil spec your engine requires.
Why the "3,000 miles" advice is outdated
The 3,000-mile rule comes from the era of conventional mineral oil and carbureted engines. Modern full-synthetic oils are formulated to stay stable for 7,500–15,000 miles, and modern engines run cleaner, cooler, and tighter than the engines that rule was written for. Most car manuals printed in the last 15 years specify intervals between 7,500 and 10,000 miles for normal use.
The 3,000-mile interval persists because quick-lube shops profit from frequent changes. It isn't wrong — it's just much more often than you actually need.
The two intervals that matter
Every oil change interval is really two intervals: a mileage interval and a time interval. You change oil at whichever comes first.
- Mileage interval — how many miles the oil can safely lubricate before its additive package breaks down.
- Time interval — how long oil can sit in an engine before condensation, fuel dilution, and oxidation degrade it, regardless of miles driven.
If you drive 50,000 miles a year, mileage hits first. If you drive 3,000 miles a year, time hits first. Don't ignore either.
What counts as "severe" driving
Most owner's manuals list a "severe" service schedule for harsher conditions. You qualify if any of these apply:
- Most trips are under 5–10 miles (engine never reaches full operating temperature).
- Frequent stop-and-go urban driving.
- Towing or hauling heavy loads.
- Driving in extreme heat (>90°F) or extreme cold (<0°F) regularly.
- Driving on dirt or dusty roads.
If two or more apply, definitely use the severe interval (which is roughly 50–60% of the normal interval). Many drivers who think they have "normal" conditions actually qualify for severe — short urban commutes are the most common culprit.
Track your changes with Maintory
The hardest part of any oil-change schedule is remembering when the last one was. Maintory's reminder engine handles this: set the interval once (mileage and months), mark each oil change done, and the next reminder appears automatically — quietly, on the home screen, with no badge spam or alarmist warnings.
Related guides & calculators
Set the interval once, never miss another oil change.
Maintory turns your interval into a quiet reminder, automatically re-anchored every service.
