happytails.ai

Oil change interval tracker

Open Oil change interval tracker on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "oil-change-interval-tracker",
  "category": "calculators",
  "built": true,
  "requirements": "Distance interval 500 to 100,000 km, time interval 1 to 60 months, odometer 0 to 2,000,000 km, typical distance up to 10,000 km a month, 1 to 20 planned changes and dates from 1900-01-01 to 2200-12-31. Calculated on your device; download a JSON report and CSV files of results and the plan.",
  "implementation": {
    "fields": [
      {
        "key": "distanceUnit",
        "label": "Distance unit",
        "value": "km",
        "type": "select",
        "values": [
          "km",
          "mi"
        ]
      },
      {
        "key": "lastDate",
        "label": "Date of last oil change",
        "value": "2026-04-15",
        "type": "date"
      },
      {
        "key": "lastOdometer",
        "label": "Odometer at last oil change",
        "value": 42000,
        "type": "number",
        "min": 0,
        "step": "any"
      },
      {
        "key": "intervalDistance",
        "label": "Distance interval",
        "value": 10000,
        "type": "number",
        "min": 0,
        "step": "any",
        "help": "From your owner’s manual or service schedule."
      },
      {
        "key": "intervalMonths",
        "label": "Time interval (months)",
        "value": 12,
        "type": "number",
        "min": 1,
        "max": 60,
        "step": 1,
        "help": "The oil change is due at the distance or the time, whichever comes first."
      },
      {
        "key": "currentDate",
        "label": "Date of current reading",
        "value": "2026-10-16",
        "type": "date"
      },
      {
        "key": "currentOdometer",
        "label": "Current odometer reading",
        "value": 47500,
        "type": "number",
        "min": 0,
        "step": "any"
      },
      {
        "key": "monthlyDistance",
        "label": "Typical distance per month (optional)",
        "value": "",
        "type": "number",
        "min": 0,
        "step": "any",
        "help": "Used from the current reading on. Leave empty to use the rate between the last oil change and the current reading."
      },
      {
        "key": "services",
        "label": "Oil changes to plan",
        "value": 5,
        "type": "number",
        "min": 1,
        "max": 20,
        "step": 1
      }
    ],
    "registrationFamily": "vehicle-and-cycling",
    "input": false,
    "live": true,
    "presentation": "metrics",
    "note": "Calculated on your device from the distance and time intervals you enter, for up to 20 planned services. Use the intervals in your owner’s manual.",
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
      "helpParts": [
        "Change the input or settings to update your result.",
        "Results update as you type.",
        "Up to 1,000,000 characters."
      ],
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Find when your next oil change is due from the distance and time intervals in your owner’s manual, whichever comes first. Plan the next few changes from how much you drive.

How to use Oil change interval tracker
  1. Enter the date and odometer reading of your last oil change.
  2. Enter the distance and time intervals from your owner’s manual or service schedule.
  3. Enter today’s date and odometer reading, a typical distance per month if you know it, and how many changes to plan.
  4. Review the next due date and odometer and the plan, then download the JSON report or CSV.

Useful next steps

Fuel economy logVehicle depreciation calculatorAdd days

Distance or time, whichever comes first

CalRecycle’s Check Your Number campaign asks drivers to use the oil change interval in the owner’s manual rather than an old 3,000 mile habit, and service schedules such as the example on Mobil’s guide give both miles and months, whichever comes first (both checked 16 October 2026). This tracker uses the intervals you enter and plans each change at whichever rule comes first.

How the date is projected

Your driving rate is the distance between the last oil change and the current reading divided by the days between them, unless you enter a typical distance per month. Either rate projects forward from the current reading, so the readings you enter are kept. In the example, 5,500 km over 184 days reaches the 10,000 km interval on 15 March 2027, a month before the 12 month time limit on 15 April 2027, and 4,500 km are left on the distance interval today. The time rule adds calendar months, so 31 August plus 6 months is 28 February.

Limits

Distance intervals from 500 to 100,000 km, time intervals of 1 to 60 months and up to 20 planned changes, with dates up to 2200-12-31. Oil life monitors, severe service schedules and warranty terms are not modelled, so follow your vehicle maker when they differ. Unit conversions use NIST SP 811 factors.