Oil Change Interval Calculator
Find out when your next oil change is due by mileage and by date.
Use the interval from your owner manual. The service is due at whichever of mileage or time comes first.
Forgetting an oil change is easy, and the sticker on the windshield is not always accurate. Enter your odometer readings and the service interval from your owner manual to see when the next oil change is due by mileage and by date.
How the calculator works
Oil is due at whichever comes first: the mileage interval or the time interval. The calculator checks both.
- Miles remaining = interval − (current odometer − odometer at last change).
- Due odometer = odometer at last change + interval.
- Due by mileage date = today + miles remaining ÷ (miles per year ÷ 365).
- Due by time = date of last change + interval in months.
Worked example
Which interval should I use?
Use the figure in your owner manual for your engine and oil type. Many modern cars with synthetic oil use longer intervals than older cars, and manuals often list a shorter interval for severe use such as short trips, towing, dust or extreme temperatures. The vehicle’s own oil life monitor can also be a guide when the manual refers to it.
Common mistakes
- Using a rule of thumb instead of the owner manual interval for the actual engine and oil.
- Ignoring the time limit when you drive few miles each year. Oil ages even when the car sits.
- Confusing the oil change reminder with the oil pressure warning light. They mean different things.
- Resetting the reminder without actually changing the oil and filter.
- Assuming severe driving conditions do not apply to short trips and stop-and-go use.
Intervals vary by vehicle, engine and oil. This is a planning aid, not a service recommendation.
Frequently asked questions
How often should I change my oil?
Follow the interval in your owner manual for your engine and oil type. It varies by vehicle and by how you drive.
Does oil expire if I barely drive?
Oil breaks down over time as well as with distance, which is why manuals usually give a time limit alongside the mileage limit.
Is the oil change reminder the same as the oil pressure light?
No. The reminder is a maintenance prompt. The oil pressure light warns of a problem and needs immediate attention.
Can I use this for other services?
Yes. Enter the interval for another service, such as a filter or rotation, to track when it is due.