Your service book says 15,000 km or 12 months - but which deadline hits first? Enter your last service date, current mileage and manufacturer interval. The calculator shows exactly when your next service is due - by date or by distance, whichever comes first.
Car Maintenance Schedule Calculator - Next Service Date
Your service book says 15,000 km or 12 months - but which deadline hits first? Enter your last service date, current mileage and manufacturer interval. The calculator shows exactly when your next service is due - by date or by distance, whichever comes first.
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Your service book says 15,000 km or 12 months - but which deadline hits first?
Every car manufacturer sets two service thresholds: a time limit and a mileage limit. Whichever you reach first triggers the next service. A commuter driving 25,000 km per year hits the mileage threshold in 7 months - well before the 12-month mark. A retiree driving 5,000 km per year reaches the date limit first. This calculator tracks both deadlines simultaneously and tells you exactly when your next service is due.
How to use this calculator - step by step
- Last service date - enter the date from your service book, invoice or windshield sticker. Format: YYYY-MM-DD.
- Mileage at last service - the odometer reading recorded at your most recent service. Check the service receipt.
- Current mileage - your current odometer reading. Read it from the dashboard.
- Time interval - how many months between services. Default: 12 months. Some manufacturers (BMW, Mercedes) use 24-month intervals with long-life oil.
- Distance interval - how many kilometers between services. Default: 15,000 km. Diesel engines often use 20,000-30,000 km intervals.
- Read the results - the calculator shows a color-coded status (OK, soon, overdue), both deadlines side by side and a progress bar.
The problem: missed service deadlines cost real money
What happens when you skip a service?
Degraded oil increases engine wear by up to 40%. A missed timing belt replacement can destroy the engine entirely - repair cost: $3,000-8,000. Warranty claims are rejected if the service log shows gaps. The average car owner loses $1,200 in resale value per missed service stamp.
The solution: track both deadlines automatically
Enter your last service data once. The calculator compares today's date and current mileage against both thresholds. Red means overdue. Yellow means soon. Green means you have time. The progress bar shows exactly how much of the interval you have used.
Service intervals by manufacturer
| Manufacturer | Time (months) | Mileage (km) | Notes |
|---|---|---|---|
| Toyota / Lexus | 12 | 15,000 | Some models allow 20,000 km with synthetic oil |
| Volkswagen / Audi / Skoda | 12-24 | 15,000-30,000 | LongLife service: up to 30,000 km / 24 months |
| BMW / Mini | 24 | 30,000 | Condition Based Service (CBS) may adjust interval |
| Mercedes-Benz | 12-24 | 25,000 | ASSYST system calculates remaining interval |
| Ford | 12 | 20,000 | EcoBoost engines: 12 months / 20,000 km |
| Hyundai / Kia | 12 | 15,000 | 5-year warranty requires strict schedule compliance |
| Honda / Mazda | 12 | 15,000 | Honda Maintenance Minder uses driving conditions |
Practical examples
Result: 12,000 km driven (80% of interval). Mileage deadline in 3,000 km. Date deadline in 5 months. Service due by mileage first.
Result: 4,500 km driven (30% of interval). Mileage deadline in 10,500 km. Date deadline in ~7 months. Service due by date first.
Result: URGENT - exceeded by 2 months AND 3,000 km. Book service immediately.
Result: 18,000 km driven (60%). Both deadlines comfortably ahead. Status: OK.
Result: OVERDUE by mileage (15,000 km driven, limit was 10,000). Commercial vehicles need shorter intervals.
Decision table: which threshold matters more?
| Driver type | Annual km | Limiting factor | Typical service frequency |
|---|---|---|---|
| High-mileage commuter | 25,000+ | Mileage | Every 7-8 months |
| Average driver | 12,000-18,000 | Both (close) | Every 10-12 months |
| Weekend driver | 5,000-8,000 | Time | Every 12 months |
| Taxi / rideshare | 60,000+ | Mileage | Every 2-3 months |
| Seasonal / stored car | < 3,000 | Time | Every 12 months (oil degrades even without driving) |
FAQ - Frequently asked questions
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