Car Maintenance Service Schedule Planner

---
name: car-maintenance-service-schedule-planner
description: Plans car maintenance from your service schedule and service history - estimates how far you drive from odometer readings, works out what is overdue, due soon or next due by distance or time (whichever comes first), bundles items into fewer workshop visits and forecasts costs with a monthly set-aside. Flags overdue safety and legal items, missing records and odometer typos. Includes an offline stdlib Python planner.
---

# Car Maintenance Service Schedule Planner

You help car owners keep up with maintenance without overpaying. People lose track because every item runs on its own clock: oil every 15,000 km or 12 months, brake fluid every 2 years regardless of distance, the roadworthiness test every year, a timing belt at 120,000 km or 8 years. Something is always about to be due, receipts are scattered and the expensive items arrive as a surprise. You turn the owner's schedule and their service history into a clear list of what is due, a short visit plan that groups items into as few workshop trips as possible, and a cost forecast they can budget for.

You plan from the intervals the owner gives you (from the owner's manual, the service booklet or the dealer). You do not diagnose faults or decide whether a part is worn; tell the user to follow the workshop's findings and the manufacturer's schedule, and to get warning lights, noises, brake or steering problems checked straight away.

## Files in this skill

- `scripts/car_service_plan.py` - reads a car JSON (vehicle, current odometer, schedule items with km and/or month intervals, severe-service intervals, first-test delay, cost, safety/legal flags, name aliases) and a service log CSV (date, odometer, items separated by ";", cost, shop); estimates yearly distance from the readings, finds the last time each item was done, computes the next due date by time and by projected distance, statuses OVERDUE / DUE SOON / OK, bundled workshop visits over the horizon and costs per quarter; reports findings CS01-CS09 (Python 3.8+ standard library only)
- `references/intervals-and-severe-service.md` - how to read the manufacturer's schedule, time vs distance, severe-service conditions, typical item notes and what never to postpone
- `references/checks-and-codes.md` - every finding code, its severity and what to do, plus the input fields
- `templates/service-plan.md` - the one-page plan and the checklist to take to the workshop
- `examples/car.json` - a 2019 petrol estate car at 83,400 km with 11 schedule items (illustrative intervals and prices - replace with your manual's)
- `examples/service-log.csv` - seven years of service history with combined visits, an alias ("Oil change"), an item not in the schedule and an odometer typo
- `examples/service-plan.md` - the real planner output on the example

## Workflow

### 1. Collect the schedule and the history
Ask for the make, model, engine and first registration date, today's odometer reading, and the maintenance schedule from the owner's manual or service booklet (item, distance interval, time interval, severe-service intervals if they drive mostly short trips, tow, or drive in dust or extreme heat or cold). Ask for the service history: invoices, stamps in the service book or the dealer's printout, with date, odometer and what was done. Add rough prices from their workshop's last invoices. Write them into a car JSON like `examples/car.json` and a log like `examples/service-log.csv`.

### 2. Run the planner
```
python3 scripts/car_service_plan.py examples/car.json examples/service-log.csv
python3 scripts/car_service_plan.py car.json log.csv --odometer 84100 --today 2026-11-20
python3 scripts/car_service_plan.py car.json log.csv --severe --horizon 36
python3 scripts/car_service_plan.py car.json log.csv --json
python3 scripts/car_service_plan.py --self-test
```
Exit 0 = no overdue safety or legal item, 1 = a safety/legal item is overdue (or the log has a high finding), 2 = bad input. Without a shell, for each item take the last date and odometer, add both intervals, convert the distance to a date with the yearly distance, and take the earlier one.

### 3. Read the result
- High first: CS01 high (overdue brakes, brake fluid, tyres, legal test) - drive carefully and book now; CS04 high (dates in the future, readings above today's) - fix the log.
- Medium: other overdue items, items due soon, items with no record (CS03 - counted from new, so check the service book before paying for them) and odometer readings that go backwards.
- Low/info: big-ticket items inside the plan (CS08), items done well before their interval (CS05), log entries not in the schedule, severe intervals in use.
- If the yearly distance looks wrong, check the readings; use `--odometer` with today's reading.

### 4. Plan the visits
Use the visit table: book visit 1 for everything overdue plus what is due within the bundle window, and ask the workshop to quote the whole list in one go. Move a cheap item a few weeks forward if it saves a trip, but never push a safety or legal item later. Fill `templates/service-plan.md` with the visits, the checklist for the workshop and the monthly set-aside.

### 5. Deliver
Return the overdue and due-soon list in plain words, the visit plan with dates and estimated costs, the 12- and 24-month cost forecast and the monthly amount to put aside, plus questions to check (records for items with no history, the exact interval for their engine, warranty conditions that require dealer servicing).

## Example result
For the 2019 Octavia at 83,400 km (about 11,000 km a year) four items are overdue: brake fluid (126 days, safety), the inspection service and air filter (by time) and the tyre rotation (3,300 km), and the roadworthiness test is due on 20 Nov 2026 - one visit now covers all five for about 410 EUR. There is no record of the timing belt, so it is counted from new and due by age in November 2027 (about 680 EUR), and new tyres are projected for June 2027 (about 560 EUR). Maintenance over the next 24 months comes to about 2,445 EUR, so set aside about 102 EUR a month. The 4,790 km reading in Sept 2023 is a typo and is ignored.

## Rules

- Use the manufacturer's intervals for the exact engine; the example values are illustrative only.
- Whichever comes first: an item is due at the earlier of its distance and its time limit, even for a car that is hardly driven.
- Never suggest postponing brakes, tyres, steering, warning lights or a legal test to save money or a trip.
- An item with no record is unknown, not done: say so and suggest checking the service book or asking the workshop.
- Costs are estimates; tell the user to get a quote, and mention warranty conditions before suggesting an independent garage.
FILE:references/intervals-and-severe-service.md
# Intervals and severe service

## Where the intervals come from
- The owner's manual or service booklet for your exact model, engine and model year. The same model can have different schedules for petrol, diesel and hybrid engines, and for "fixed" vs "flexible/long-life" service regimes.
- Many cars show the next oil service on the dashboard (service indicator). If it disagrees with the booklet, ask the dealer which regime the car is set to.
- Keep warranty conditions in mind: some manufacturers require servicing to their schedule with genuine-spec parts; independent garages are usually fine if they follow the schedule and keep invoices.

## Whichever comes first
Every item with both a distance and a time interval is due at the EARLIER of the two. Low-mileage cars hit the time limit (oil ages, brake fluid absorbs water, rubber belts and tyres age); high-mileage cars hit the distance limit. The planner projects the distance limit to a date with your yearly distance.

## Severe service
Most manuals list shorter intervals when the car is used mostly for:
- short trips (under about 10 km, engine rarely fully warm), especially in cold weather;
- stop-and-go city traffic, taxi or delivery use, long idling;
- towing a trailer or caravan, roof loads, mountain driving;
- dusty or sandy roads, very hot or very cold climates.
If any of these describe most of your driving, use `--severe` (or `"severe": true`) so items with `severe_km` / `severe_months` use the shorter interval.

## Item notes (typical, check your manual)
| Item | Typical basis | Notes |
|---|---|---|
| Engine oil and filter | distance and time | the most important routine item; use the oil spec in the manual |
| Inspection service | distance and time | the bigger service; usually includes many checks |
| Brake fluid | time only (often 2 years) | absorbs water; never postpone |
| Brake inspection / pads / discs | distance and time | replace on wear, not on a fixed interval |
| Coolant | time or "lifetime" | check level and freeze protection each winter |
| Air filter, cabin filter | distance and time | shorter in dusty or polluted areas |
| Spark plugs (petrol) | distance and time | long intervals on modern engines |
| Timing belt (if fitted) | distance and time | failure can destroy the engine; often changed with the water pump; chains usually have no interval |
| Tyres | wear and age | check tread depth monthly; many makers suggest replacing at 6-10 years regardless of tread |
| Tyre rotation | distance | if your manual recommends it (not for different-size front/rear tyres) |
| Roadworthiness test | time (legal) | first test after a few years (e.g. 3 or 4), then every 1-2 years depending on the country |
| 12 V battery | condition | test before winter once it is 4-5 years old |

## Legal tests
Rules differ by country (MOT in the UK, TUV/HU in Germany, CT in France, TUVTURK in Turkey, state inspections in the US). Enter your country's first-test delay as `first_months` and the repeat interval as `months`, and mark the item `"legal": true`. Many schemes let you test a little early without losing the date; check yours before bundling it into an earlier visit.

## What never to postpone
Brakes and brake fluid, tyres (tread, damage, age), steering and suspension faults, warning lights (oil pressure, brakes, engine temperature), and the legal test. The planner marks these with `safety` / `legal` and treats them as high when overdue.

## Getting the inputs
- Odometer and date of every visit: invoices, the service book stamps, the dealer's digital service record, the legal test certificates (they record the odometer).
- Prices: your last invoices or a quote; add 10-20% for parts that are often replaced at the same time (wipers, bulbs, brake pads).
FILE:references/checks-and-codes.md
# Checks and finding codes

| Code | Severity | Check | What to do |
|---|---|---|---|
| CS01 | high: safety or legal item overdue; medium: other item overdue | due date or due distance passed | book it; for safety items drive carefully until done |
| CS02 | medium | due within `due_soon.days` or `due_soon.km` | book it with the next visit |
| CS03 | medium | no record of the item in the log: counted from first registration | check the service book / receipts / dealer record before paying for it |
| CS04 | high: date in the future, reading above the current odometer; medium: reading lower than an earlier one, unreadable odometer | log consistency | fix the typo; the reading is ignored for distance and due calculations |
| CS05 | info | last done at under 60% of both intervals | fine if intended (severe use, warranty); otherwise money spent early |
| CS06 | info | severe-service intervals in use | check the conditions still apply |
| CS07 | info | log item not in your schedule (repairs, extras) | kept for history; add aliases if it is a schedule item under another name |
| CS08 | low | item costing 400 or more falls inside the plan horizon | budget for it; get a quote early |
| CS09 | medium | not enough odometer readings (a reading at least 60 days back): default yearly distance used | add readings (test certificates, fuel app, photos of the dashboard

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