Check your oil with the dipstick while the engine is cold and parked on level ground
The dipstick is a long metal rod with markings on the end that shows how much oil is in your engine. To get an accurate reading, turn off your engine and wait at least five minutes so the oil settles. Park on flat ground — a slope will give you a false reading. Open your hood and locate the dipstick, which usually has a bright yellow or orange handle and sits near the front or side of the engine.
Pull the dipstick straight out and wipe it clean with a paper towel or rag. This removes the old oil coating so you can see the fresh oil level clearly. Reinsert the dipstick all the way back into its tube until it seats fully, then pull it out again. This second pull shows you the true oil level.
Key Takeaways
- Always check oil when the engine is cold and the car is parked on level ground, or the reading will be wrong.
- The dipstick has two marks — minimum and maximum — and your oil should be between them or at the maximum line.
- If oil is below the minimum mark, add the type and grade your owner's manual specifies, checking the level after each quart.
- Checking every month or before long trips takes less than two minutes and can catch leaks or burning before they become expensive.
Reading the dipstick markings
The dipstick has two marks at the end: a minimum line (often labeled "MIN" or shown as a lower notch) and a maximum line (labeled "MAX" or a higher notch). Your oil level should reach somewhere between these two marks, or ideally at the maximum line. If the oil only reaches the minimum mark, you are not in when ready danger, but you should add oil soon.
If the oil is below the minimum mark, your engine is running with less protection than it should have. This increases wear on engine parts and can lead to damage over time. If the oil is above the maximum mark, the excess can damage the engine seals and cause leaks. Either way, the level needs adjustment.
What type of oil to add if the level is low
Your owner's manual specifies the exact oil grade your engine needs — something like 5W-30 or 10W-40. The numbers matter because they affect how the oil flows at different temperatures. Using the wrong grade can reduce fuel economy or leave parts unprotected. Buy the correct type before you need it, so you have it on hand.
To add oil, locate the oil filler cap on top of the engine — it usually has an oil can symbol printed on it. Twist it off and set it somewhere clean. Pour in about half a quart, wait a minute for it to drain down, then check the dipstick again. Add more in small amounts until the level reaches the maximum mark. Do not overfill. Screw the cap back on firmly.
How often to check your oil
Check your oil at least once a month, or before any long road trip. Newer cars with synthetic oil may go longer between checks than older cars with conventional oil, but monthly checks catch problems early. If you notice the level dropping noticeably between checks — more than a quart per month — your car may have a leak or be burning oil, and you should have a mechanic look at it.
Some cars have electronic oil level displays on the dashboard instead of a traditional dipstick. If yours does, follow the menu prompts to view the level. The principle is the same: check when the engine is cold and parked level, and add oil if needed.
Signs that your oil needs attention right away
If your dashboard oil pressure warning light comes on — usually a symbol that looks like an oil can or a dripping drop — stop driving and check your oil when ready. A lit warning light means oil pressure has dropped dangerously low, which can damage the engine in minutes. If the level is low, add oil and see if the light goes out. If it stays on after you add oil, do not drive the car; have it towed to a mechanic.
Dark or dirty-looking oil on the dipstick does not necessarily mean you need to change it — that is a separate decision based on mileage and time — but it does mean the oil is doing its job of collecting debris. The level is what matters for this check.
Common mistakes when checking oil
The most common mistake is checking the oil while the engine is still warm or hot. Hot oil expands and gives a false high reading, so you might think you have enough oil when you actually do not. Always wait at least five minutes after turning off the engine. If you just drove the car, wait longer.
Another mistake is checking on a slope or in a parking spot that tilts to one side. Oil will pool toward the low side and give you an inaccurate reading. Pull onto level ground or into a garage before you check. Finally, do not trust a single wipe of the dipstick — wipe it twice, reinserting fully between wipes, to make sure you are reading the actual oil level and not residue.
Frequently Asked Questions
What if I cannot find the dipstick under my hood?
Some newer cars have electronic oil sensors instead of a traditional dipstick and show the level on the dashboard menu. Check your owner's manual to see which system your car has. If your car should have a dipstick but you cannot locate it, the manual will show you exactly where it sits and what color the handle is.
Can I check the oil while the engine is warm but not hot?
No. Even warm oil expands and gives a false reading. Wait at least five minutes after turning off the engine, longer if you just finished driving. If you are in a hurry, come back and check later when the engine has fully cooled. An inaccurate reading is worse than no check at all.
How much does it cost to add oil if the level is low?
A quart of oil costs between three and ten dollars depending on the type and brand. Synthetic oil costs more than conventional. Buying a few quarts to keep in your car is cheap insurance against running low between oil changes.
Does checking the oil use any of it up?
No. Checking the dipstick does not remove oil or cause any loss. The small amount that clings to the dipstick when you pull it out is negligible and stays in the engine when you reinsert it.
What should I do if the oil level keeps dropping between checks?
A drop of a quart or more per month usually means either a leak or the engine is burning oil. Both need a mechanic's attention. A small leak might be a loose drain plug or a worn gasket. Burning oil can mean worn piston rings or valve seals. Have it checked before the problem gets worse.