Maintenance procedure · Written to ASD-STE100 Issue 9 · Formatted to ANSI Z535

Check the Engine Oil Level, and Confirm Which Oil the Vehicle Takes

Passenger cars and light trucks with a dipstick — read the level correctly, top up without overfilling, and settle the oil grade from the documentation rather than from a guess
ApplicabilityPassenger cars and light trucks with an engine oil dipstick
Task time19 min to 44 min editorial estimate, not a measurement
PersonnelOne
Revisionv1 · 2026-07-29
BEFORE YOU BEGIN

Before you begin. This procedure is general reference information, not professional advice. Equipment varies by manufacturer, model, and year. Always follow the documentation supplied with your equipment — where it differs from this page, follow the manufacturer. Verify that you have the tools, the working conditions, and the ability to do this task safely. If anything is unclear, if the equipment is damaged, or if the task exceeds your experience, stop and use a qualified professional. You are responsible for your own safety and for the outcome. This site accepts no liability for any loss, damage, or injury arising from the use of this information.

Specifications marked unverified could not be traced to a manufacturer source. Do not rely on them — obtain the value from your equipment documentation.

A cartoon car stands on a level driveway with its hood open. The engine is off. A dipstick, a clean cloth, a flashlight, a funnel, and a closed manual are on a tray beside it.
Thematic illustrationIllustration only. Follow the written steps and safety instructions.

Summary

Checking the oil is two jobs that people run together. The first is a measurement: is there enough oil in the engine right now. The second is a specification question: which oil does this engine take when you need to add some. This page keeps them apart, because the measurement is the same on almost every car with a dipstick and the specification is different on almost every car — sometimes different between two engines in the same model, in the same year.

What this page will not print is a viscosity grade, an oil standard or a capacity for your engine. Those come from your own vehicle documentation and from the label on the oil filler cap, and a page that guessed one would be guessing with the thing that actually damages an engine. There is one more honest wrinkle. Manufacturers do not agree on the state the engine should be in when you read the dipstick: Mazda asks you to warm the engine, stop it and wait at least five minutes, while Subaru simply asks you to park level, switch off and wait a few minutes. Both are on this page, neither is averaged, and your own manual is the tie-breaker.

Necessary equipment

ItemNote
Clean clothUse a cloth that does not leave material on the dipstick.
Flashlight optionalThe light in the engine compartment is often low.
Funnel optionalA funnel prevents a spill at the oil filler.
Pen and paper optionalRecord the level and the date after each check.
Vehicle documentationThe documentation gives the oil for this engine.
Engine oil materialUse only the oil that the vehicle documentation specifies.

Specifications

Distance or period between oil changes
Unverified — do not rely on this value
CONSULT THE MAINTENANCE SCHEDULE FOR THE VEHICLE

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

Prepare the vehicle

Estimated 7 min to 11 min

NOTEThe level on the dipstick is correct only on a level surface.
State of the engine before a reading of the dipstick
Unverified — do not rely on this value
CONSULT THE VEHICLE DOCUMENTATION. MANUFACTURERS DO NOT GIVE THE SAME CONDITION.

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

Two tier-1 manufacturer sources give different preconditions for the same measurement, and this page publishes the disagreement rather than reconciling it. Mazda's owner's manual instructs the owner to warm the engine to normal operating temperature, turn it off, and wait at least 5 minutes for the oil to return to the oil pan before reading the dipstick (mazda3-inspecting-engine-oil, mazda-cx30-inspecting-engine-oil-level). Subaru's own owner guidance instructs the owner to park on a level surface and turn the engine off, then read the dipstick after a few minutes, with no instruction to warm the engine first (subaru-how-to-check-engine-oil). A warm engine and a cold one do not give the same reading, and neither does a 5 minute wait and a 1 minute wait, so averaging the two would produce a number neither manufacturer stands behind. The documentation for the reader's own vehicle governs.
WARNING

STOP THE VEHICLE ON A LEVEL SURFACE AWAY FROM TRAFFIC.
Traffic can kill you.

  1. Stop the vehicle on a level surface away from traffic.
    • A slope moves the oil in the pan and gives a wrong reading.
    <1m
  2. Set the parking brake.
    <1m
WARNING

SET THE IGNITION TO OFF BEFORE YOU OPEN THE HOOD.
The cooling fan can start with no warning. The fan can injure your hand.

  1. Set the ignition to off.
    <1m
  2. Read the condition that the vehicle documentation gives for this measurement.
    • Mazda gives a warm engine, then a wait of at least 5 minutes after you stop it.
    • Subaru gives a level surface, a stopped engine, and a wait of a few minutes.
    • The two instructions are not the same. Use the instruction for your own vehicle.
    2m
  3. Wait for the period that your documentation gives.
    • The oil goes down to the pan in this period.
    5m

Open the hood

Estimated 1 min to 3 min

  1. Pull the hood release inside the vehicle.
    • The release is usually below the instrument panel on the driver side.
    <1m
WARNING

THE ENGINE AND THE PARTS NEAR IT CAN BE VERY HOT.
A hot part can burn your skin. Let the engine become cool before you touch a part.

  1. Release the second latch below the front edge of the hood.
    <1m
  2. Lift the hood.
    <1m
  3. If the hood has a support rod, put the rod in its hole.
    <1m

Read the level on the dipstick

Estimated 3 min to 5 min

Quantity of oil between the lower mark and the upper mark
Unverified — do not rely on this value
CONSULT THE VEHICLE DOCUMENTATION

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

  1. Find the dipstick for the engine oil.
    • The handle of the dipstick has a different colour on many vehicles.
    • The vehicle documentation shows the position for your engine.
    <1m
  2. Remove the dipstick from the tube.
    <1m
  3. Clean the dipstick with a cloth.
    <1m
  4. Install the dipstick fully into the tube.
    • Mazda tells owners to put the dipstick in fully, and to make the O-ring correct first.
    <1m
  5. Remove the dipstick again.
    <1m
  6. Hold the dipstick in a horizontal position.
    • The oil moves along a dipstick that you hold at an angle.
    <1m
  7. Find the two marks at the end of the dipstick.
    • Some dipsticks show the words MIN and MAX.
    • Some dipsticks show the letters L and F.
    • Some dipsticks show two holes or two notches.
    <1m
  8. Look at the two faces of the dipstick.
    • Subaru tells owners to use only the lower of the two readings.
    <1m
  9. Read the level of the oil against the two marks.
    • The level is correct if the oil is between the two marks.
    • The level is low if the oil is at the lower mark or below it.
    <1m

Add oil if the level is low

Estimated 4 min to 18 min

Engine oil capacity
Unverified — do not rely on this value
CONSULT THE VEHICLE DOCUMENTATION

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

NOTICE

USE ONLY THE OIL THAT THE VEHICLE DOCUMENTATION SPECIFIES.
The wrong oil can cause damage to the engine.

  1. If the level is low, get the oil that the vehicle documentation specifies.
    • Do not use a different oil because a shop or a web page suggests it.
    1m
  2. Remove the cap from the oil filler.
    • The oil filler cap is on the top of the engine, and it is not the dipstick.
    <1m
WARNING

DO NOT SPILL OIL ON THE ENGINE.
A spill of oil on a hot part can catch fire.

  1. Add the oil in small quantities.
    • Use a funnel to prevent a spill.
    • Subaru tells owners to add the oil slowly.
    1m
NOTICE

DO NOT PUT MORE OIL THAN THE UPPER MARK SHOWS.
Mazda tells owners that too much oil can cause damage to the engine.

  1. Do a new measurement of the level after each quantity.
    • Do steps s11 to s18 again for each new measurement.
    1m
  2. Stop when the level is at the upper mark.
    <1m
  3. Install the cap on the oil filler.
    <1m

Find the oil for this engine

Estimated 2 min to 6 min

Engine oil viscosity grade
Unverified — do not rely on this value
CONSULT THE VEHICLE DOCUMENTATION AND THE LABEL ON THE OIL FILLER CAP

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

Engine oil quality designation
Unverified — do not rely on this value
CONSULT THE VEHICLE DOCUMENTATION

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

  1. Read the oil that the vehicle documentation specifies for this engine.
    • Mazda gives one oil for one engine and a different oil for a second engine in the same model.
    • The documentation gives a viscosity grade and a quality designation.
    2m
  2. Read the label on the oil filler cap.
    <1m
  3. If the label and the documentation do not agree, do not add oil. Speak to a dealer for your make.
    • A change of engine or a change of owner can make the two disagree.
    <1m

Close the vehicle

Estimated 2 min

  1. Install the dipstick fully into the tube.
    <1m
  2. Remove your hands and the cloth from the engine compartment.
    <1m
  3. Close the hood.
    <1m
  4. Record the date, the level, and the quantity of oil that you added.
    <1m

Terminology

This page uses one term for each item and holds it throughout, as ASD-STE100 requires. Equipment sellers and other guides use the names below for the same parts.

dipstick
Also called: oil level gauge, oil stick, engine oil dipstick, the stick you pull out to check the oil
engine oil
Also called: motor oil, car oil, engine lubricant, 5w30, 0w20
viscosity grade
Also called: oil weight, oil grade, SAE grade, what oil does my car take
oil filler cap
Also called: oil cap, where you pour the oil in, engine oil cap
hood
Also called: bonnet, the front lid, engine cover
engine oil level warning lamp
Also called: oil light, low oil light, oil can light, engine oil low warning light

When to use a professional

Stop if the oil is above the upper mark. Too much oil can cause damage. Speak to a vehicle repair shop before you drive.

Stop if the oil on the dipstick has a milky colour. Stop if the level goes down quickly between checks. Stop if you see oil below the vehicle. Speak to a vehicle repair shop.

Stop if the warning lamp for the oil pressure comes on. Do not drive the vehicle. Speak to a vehicle repair shop immediately.

This page does not give an oil for your vehicle. Only the vehicle manufacturer gives that. Read the documentation for your vehicle, or speak to a dealer for your make.

Common questions

How do I check my engine oil?

Park on level ground, switch the engine off, and wait for the period your own manual gives before you touch the dipstick. Pull the dipstick out, wipe it clean, push it all the way back in, and pull it out again — the first reading off an unwiped stick is oil splashed up the tube, not the level in the pan. Hold it flat and read where the oil film ends against the two marks. Subaru adds a detail most people miss: look at both faces of the dipstick and believe the lower of the two readings.

Should the engine be hot or cold when I check the oil?

It depends on who built your car, and this page will not pretend otherwise. Mazda's owner's manual tells you to warm the engine to normal operating temperature, turn it off, and wait at least five minutes for the oil to drain back into the pan. Subaru's own guidance tells you to park level, turn the engine off, and read the dipstick after a few minutes, with no instruction to warm it first. Those are genuinely different instructions and averaging them would give you a procedure neither company endorses. Read the manual for your own car and follow that one.

What oil does my car take?

Your manual and the label on the oil filler cap, and nowhere else. The grade is not a property of the brand or the model — it is a property of the specific engine, and manufacturers routinely specify different oils for two engines offered in the same car in the same year. Mazda's 2025 Mazda3 manual is a clean example: one viscosity grade for one engine and a different one for the other, in the same book. A parts-shop lookup table, a comment thread or a page like this one is not a substitute for the document that came with the vehicle.

Why does the manual say one grade and the cap say another?

Usually because the car has changed hands, changed engine, or been serviced by somebody who fitted the wrong cap. It happens more often than people expect on older cars. When the two disagree, do not split the difference and do not assume the newer-looking one is right. Stop, and ask a dealer for your make to confirm the grade against the vehicle identification number. Adding the wrong oil is cheap to avoid and expensive to fix.

I overfilled it. Does that matter?

Yes. Mazda's manual carries a plain caution not to overfill because it may cause engine damage, and every other manufacturer says a version of the same thing. Oil above the upper mark can be whipped into foam by the moving parts inside the engine, and foam does not lubricate the way liquid oil does. This is not a page that can talk you through removing the excess safely, and the honest answer is that a repair shop should drain it back to the mark before you drive.

How often should I check it?

More often than you change it. Subaru's framing is a good one: check the level regularly between oil changes, because the point is to catch a slow loss before it becomes a fast one. A monthly check, and a check before any long journey, costs about five minutes. Toyota's advice on the related question of when to change the oil is the same shape — the interval depends on the vehicle, the engine and the oil, and the owner's manual is the only reliable place to get it.

My car has no dipstick. What now?

Some newer vehicles have replaced the dipstick with an electronic level readout in the instrument cluster, and this page does not cover them. The procedure for those is model-specific, it usually requires the vehicle to be level and at a particular temperature, and the manual is the only source for it. If you cannot find a dipstick after checking the manual, do not go looking for another tube to put something into — ask a dealer for your make.

Sources

Every specification on this page is traced to one of these sources. Tier 1 is a manufacturer document, a published standard, or a government safety authority. See Standards for the full tiering rule.

  1. Tier 1Inspecting Engine Oil — 2025 Mazda3 Owner's ManualMazda North American Operations · accessed 2026-07-29 · re-verification due 2027-01-25
  2. Tier 1Inspecting Engine Oil Level — 2022 Mazda CX-30 Owner's ManualMazda North American Operations · accessed 2026-07-29 · re-verification due 2027-01-25
  3. Tier 1Car Care Tips — How to Check Engine OilSubaru of America, Inc. · accessed 2026-07-29 · re-verification due 2027-01-25
  4. Tier 1How To Tell If You May Need An Oil ChangeToyota Motor Sales, U.S.A., Inc. · accessed 2026-07-29 · re-verification due 2027-01-25

Revision history

Current version 1 · updated 2026-07-29 · next review due 2027-07-29

  1. v1 · 2026-07-29First draft. Every per-vehicle value publishes as consult-the-documentation: the viscosity grade, the quality designation, the capacity, and the quantity between the two dipstick marks. The dipstick method rests on Mazda's owner's manual and on Subaru's owner guidance. Those two sources give materially different preconditions for the reading, so the disagreement publishes as a conflict_note naming both rather than being reconciled or averaged.

Corrections to this page are listed in the public corrections log. Reports that are credible and not yet verified are listed in the public errata register, and an open one renders above the step it concerns.

Comments and corrections

Found an error? A correction with a manufacturer source is applied and logged publicly. You can also write to corrections@fixchecklist.com.

Every step above carries its own report control, which tags the report with that step so a correction reaches the right place. For anything about the procedure as a whole — the order of the sections, a step that is missing, something that did not match your equipment — use this: report something about this whole procedure.

The comment system is not connected yet. Comments are stored in GitHub Discussions through Giscus, outside this site, so that a redeploy cannot destroy them.