How to Check Your Oil Level
Learn how to read the dipstick correctly and check your engine oil level. Quick 5-minute check that could save your engine.
Why Check Your Oil Level?
Oil is your engine's lifeblood. Running with low oil can cause serious engine damage costing thousands of pounds to repair.
- Prevents engine wear: Oil lubricates moving parts
- Cools the engine: Oil helps remove heat
- Avoids costly repairs: Low oil can cause engine seizure
What You'll Need
- Clean cloth or kitchen roll - to wipe the dipstick
- Level ground - for accurate reading
- 5 minutes - and a cold engine
Step-by-Step Instructions
1. Park on Level Ground
Park your car on flat, level ground. Turn off the engine and wait 5-10 minutes for the oil to drain back into the sump. Checking with a hot engine gives inaccurate readings.
Tip: First thing in the morning before starting the car is ideal.
2. Find the Dipstick
Open the bonnet. Look for the oil dipstick - it usually has a brightly colored handle (often yellow or orange) with an oil can symbol on it.
It's normally near the front or side of the engine. Check your handbook if you can't find it.
3. Pull Out and Wipe the Dipstick
Pull the dipstick out completely. Wipe it clean with your cloth or kitchen roll. This removes old oil so you get an accurate reading.
4. Insert Dipstick Fully
Push the dipstick all the way back in until it's fully seated. Wait a second, then pull it out again.
5. Read the Oil Level
Look at where the oil comes up to on the dipstick. Most dipsticks have MIN and MAX marks (or two holes/dots).
- Between MIN and MAX: Perfect - oil level is fine
- At or below MIN: Add oil immediately
- Above MAX: Too much oil - needs draining (see a garage)
6. Replace the Dipstick
Push the dipstick all the way back in. Make sure it's fully seated. Close the bonnet.
Understanding the Dipstick
The oil should leave a mark between the MIN and MAX lines. If it's at or below MIN, add oil immediately.
How Often Should You Check?
- Once a month - Regular checks catch problems early
- Before long journeys - Especially motorway trips
- If oil light comes on - Stop and check immediately
- Older cars (100k+ miles) - Check every 2 weeks
⚠️ Warning Signs - See a Mechanic
- • Oil drops quickly between checks - may have a leak
- • Oil is very dark and gritty - needs changing
- • Oil looks milky or has white froth - possible head gasket failure
- • Smell of burning oil - could be leaking onto hot engine parts
- • Blue smoke from exhaust - engine is burning oil
Track Your Oil Checks
Log oil level checks and services in AutoChain. Get reminders for oil changes and keep your complete service history.
Checking Engine Oil: Common Questions
How often should I check my engine oil level?
Check your engine oil at least once a month and before every long journey. Modern engines can consume oil between services, particularly higher-mileage vehicles. Getting into the habit of checking the dipstick takes less than two minutes and can prevent expensive engine damage. Some cars with electronic oil monitoring give a dashboard reading, but physically checking the dipstick remains the most reliable method and is recommended by the RAC and AA.
What should I do if my oil level is below the MIN mark?
If the dipstick shows oil at or below the MIN mark, do not drive further without topping up. Running an engine low on oil causes rapid wear and can result in catastrophic engine failure within minutes. Add the correct oil grade in 200-300ml increments, re-checking the dipstick each time. Do not overfill past the MAX mark — overfilling causes oil to foam, which reduces lubrication and can damage engine seals and the catalytic converter.
My oil level drops quickly between services — should I be worried?
Some oil consumption between services is normal, especially in older or high-mileage engines. However, if you are topping up more than about 500ml per 1,000 miles, this may indicate a problem: an oil leak, worn valve stem seals, or worn piston rings. Warning signs include blue-tinged exhaust smoke, oil patches under the parked car, or a burning smell. If your oil level drops noticeably fast, have the vehicle inspected by a garage to identify the cause before it worsens.
What type of engine oil does my car need?
The correct oil specification for your vehicle is printed in the owner's manual and sometimes on a sticker inside the oil filler cap or engine bay. Common UK grades include 5W-30, 5W-40, and 0W-20 — the numbers indicate viscosity in cold and operating temperatures. Using the wrong specification can reduce engine protection and in some cases void a manufacturer warranty. If in doubt, your local garage or the vehicle manufacturer's website can confirm the correct grade for your engine.
Can I mix different brands of engine oil?
In an emergency you can mix different brands of engine oil, provided they share the same specification grade — for example, two different brands both labelled 5W-30 fully synthetic. Avoid mixing different viscosity grades or mixing mineral oil with fully synthetic. If you do mix in an emergency, plan a full oil change at your next service interval. Regularly topping up with a different grade to what is already in the engine is not recommended as it can degrade the oil's performance over time.
Related Guides
Why these knowledge-base guides matter
AutoChain's knowledge-base content is designed to help UK drivers understand everyday maintenance, ownership, safety, and garage decisions without needing specialist jargon. Many vehicle owners want a clear explanation before they decide whether to carry out a simple check themselves, book a garage, or compare the advice they have already been given.
These guides also support better record keeping. When you understand what was checked, what was replaced, and what should happen next, it becomes much easier to keep a useful service history, discuss repairs with confidence, and protect the long-term value of the vehicle.
The aim is not to turn every driver into a mechanic. It is to explain the basics clearly enough that common tasks, warning signs, and maintenance decisions feel less opaque. That is useful whether you want to top up a fluid yourself, prepare for an MOT, compare a garage recommendation with manufacturer guidance, or simply understand what a warning light may be telling you before you book the car in.
UK motorists also deal with weather, road conditions, seasonal demands, congestion, and regulatory processes that can affect how cars wear and how maintenance should be prioritised. Context matters. Advice that is too generic often leaves out the details that are most useful in real ownership situations, especially for older vehicles, family cars, and drivers who want to keep costs predictable.
When a guide helps you understand the reason behind a task, it becomes easier to speak to a garage with more confidence and to keep a more accurate record of what was done. That improves long-term ownership, helps with resale, and reduces the chance that important work is forgotten between services.
The same principle applies to garage and business content within the hub. Workshops make better operational decisions when software, reminders, customer communication, and record keeping are explained in plain language rather than buried in vague marketing claims. Practical guidance is more useful when it shows how systems affect bookings, retention, repeat work, and trust over time.
Clear explanations also make it easier for readers to keep more accurate records of their own maintenance and service decisions, which strengthens both long-term ownership and the credibility of the vehicle history later on.