Oil Change Interval Calculator
When your next oil change is really due.
Enter your values
ⓘ Live results
Results
- Next change due at
- 49,500 mi
- Interval
- 7,500 mi
- Months until due
- 7.5 months
- Changes per year
- 1.6
- Oil cost per mile
- $0.01
Quick answer
Severe service — short trips, towing, dust or extreme temperatures — roughly halves the safe oil change interval regardless of oil type.
Next change = last change + base interval × severity factor
How to use the Oil Change Interval Calculator
- 1Pick the oil grade you actually use.
- 2Choose the conditions you drive in most — short trips count as severe.
- 3Enter the odometer reading at the last change.
Worked example
Using the values the calculator loads with:
Inputs
- Oil typeFull synthetic
- Driving conditionsMixed driving
- Odometer at last change42000 mi
- Miles per month1000 mi
- Cost per oil change80 $
Results
- Next change due at49,500 mi
- Interval7,500 mi
- Months until due7.5 months
- Changes per year1.6
- Oil cost per mile$0.01
Frequently asked questions
Is 3,000 miles still the rule?
Not for modern engines on synthetic oil. Most manufacturers specify 7,500–15,000 miles, though severe-service driving justifies shorter intervals.
Does oil expire if I barely drive?
Yes — change it at least once a year. Oil absorbs moisture and fuel from short trips, and additives break down over time.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.