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Service Interval Tracker
Find your next service based on mileage and average monthly driving.
Why does a service interval depend on both mileage and time?
Most automakers define the service interval with two numbers: a mileage figure (say, every 7,500 miles) and a time figure (say, every 6 months) — and the recommendation is to go by whichever one arrives first. Based on the average monthly mileage you enter, this calculator estimates which limit you'll hit first: if you drive a lot, the mileage limit is usually reached first; if you drive your car lightly, the time limit usually comes first, since some lubricants and fluids degrade with age even without much driving.
This tool's defaults (7,500 miles and 6 months) reflect a common conventional-oil service interval in the US, but the exact interval varies by car, oil type (synthetic vs. conventional) and driving conditions (heavy city traffic, dust, towing). Both numbers here are fully editable — always treat your car's owner's manual as the final word.
Frequently asked questions
What happens if neither the mileage nor the time limit has been reached yet?
The calculator shows both the mileage remaining and the approximate time remaining until service; whichever of the two limits arrives first is always the one that determines your next service date.
Why do some cars have shorter service intervals than others?
Oil type, engine age and condition, and the manufacturer's own recommendation all affect the service interval. The 7,500-mile or 6-month figure in this tool is a common default, but should always be adjusted based on your car's owner's manual.
If I barely drive my car, why does it still need scheduled service?
Because some fluids and components (like engine oil) degrade or absorb moisture over time even without much driving — which is why a separate time-based limit exists alongside the mileage-based one.
Can this tool replace the manufacturer's service book?
No. This is a simple reminder based on your own inputs; for the precise service schedule, always refer to your owner's manual or an authorized dealer.