Check your oil with the dipstick while the engine is cold and parked on level ground
The fastest way to check oil is to pull the dipstick, wipe it clean, reinsert it fully, then pull it out again and read where the oil line sits. You need the engine off and cooled for at least five minutes, and the car parked on flat pavement — not on a slope. The whole process takes about two minutes once you locate the dipstick under the hood.
Most cars have a dipstick with two marks: a minimum line and a maximum line. Oil between those marks means your level is safe. Oil below the minimum means you should add oil before driving. Oil above the maximum is overfilled and can damage the engine, though this is rare unless someone recently added too much.
Key Takeaways
- Turn off the engine and wait at least five minutes for the oil to settle before you check, or the reading will be wrong.
- Park on flat, level ground — checking on a slope gives a false reading because the oil pools to one side.
- Pull the dipstick all the way out, wipe it completely clean on a paper towel or rag, then reinsert it fully before pulling it out to read.
- Oil between the minimum and maximum marks is normal; below minimum means add oil, and above maximum means the engine is overfilled.
- Check your oil every month or before long trips, and keep a quart of the correct oil type in your car in case you need to top off.
Locating the dipstick under your hood
Open the hood and look for a handle with a yellow or orange loop or ring. The handle is usually plastic and sticks up from the engine block. On most cars it is toward the front or side of the engine. If you cannot find it, check your owner's manual — the exact location varies by make and model.
Some newer cars do not have a traditional dipstick. Instead, they have an electronic oil sensor that displays the level on the dashboard. Check your manual to see which type your car has. If your car has no dipstick and no dashboard display, you will need to take it to a mechanic or dealership to have the oil checked.
The correct steps to read the dipstick
Pull the dipstick straight up and out of its tube. Oil will coat the stick. Wipe the entire stick clean with a paper towel, cloth rag, or old t-shirt. Do not skip this step — you cannot read the level through old oil.
Reinsert the dipstick all the way into its tube until it seats fully. You should feel it click or bottom out. Then pull it straight out again without twisting. This second pull gives you the true reading. Look at where the oil line reaches on the stick. Most dipsticks have two marks: a lower line (minimum) and an upper line (maximum). Your oil should be between them.
What the oil level marks mean
The maximum mark is the highest safe level. Oil above this line can cause pressure buildup, foam in the oil, and damage to seals and gaskets. If you are above the maximum, you will need to drain some oil out — this is a job for a mechanic unless you are experienced.
The minimum mark is the lowest safe level. If your oil is below this line, the engine does not have enough oil to lubricate all the moving parts. Driving on low oil can cause the engine to overheat and seize. If you are below the minimum, add oil before driving. Buy the correct type and weight for your car — this is printed on your oil cap and in your owner's manual.
Between the two marks is the normal operating range. Most cars run best when the oil is somewhere in the middle of this range, though anywhere between the marks is safe.
When to check your oil and what to do if it is low
Check your oil once a month and before any long road trip. Some cars burn oil faster than others, especially older ones or those with high mileage. If you find yourself adding oil every few weeks, have a mechanic inspect for leaks or internal wear.
If the dipstick shows you are below the minimum, buy a quart of the correct oil type and pour it slowly into the oil filler cap on top of the engine. Wait a minute, then check again with the dipstick. Add more if needed. Do not overfill — it is easier to add a little more than to remove excess oil.
Common mistakes that give false readings
Checking the oil while the engine is still warm or hot throws off the reading because hot oil expands. Always wait at least five minutes after turning off the engine. Checking on a slope or in a parking spot that is not level also gives a false reading because the oil pools to the lower side of the pan.
Forgetting to wipe the dipstick before reinserting it means you are reading old oil, not the current level. Pulling the dipstick out without fully reinserting it first also gives a wrong reading — the stick must seat completely in its tube. If you get a reading that seems too high or too low, repeat the process: wipe, reinsert fully, pull out, and read again.
Frequently Asked Questions
How often should I check my oil?
Check once a month and before any trip longer than a few hours. If your car is older or has high mileage, check every two weeks. If you notice the level dropping quickly, have a mechanic look for leaks or internal problems.
Can I check the oil while the engine is warm?
No. Warm oil expands and gives a false high reading. Always wait at least five minutes after turning off the engine, and longer if you have been driving hard. Cold morning checks are most accurate.
What type of oil should I add if the level is low?
Check your owner's manual or the label on your oil filler cap for the correct type and weight. Do not guess — using the wrong oil can damage the engine. Most auto parts stores can tell you the right oil if you give them your car's year, make, and model.
What does it mean if the oil level keeps dropping?
Some oil consumption is normal, especially in older cars. If you are adding a quart every few hundred miles, have a mechanic check for leaks, worn piston rings, or valve seal problems. A small leak is easier and cheaper to fix than engine damage from running low.
Do I need to check the oil if my car has an electronic display?
Electronic oil sensors are generally reliable, but some drivers still check the dipstick occasionally as a backup. If your car has no dipstick and the display shows low oil, follow the same steps: add the correct type and recheck. If the level keeps dropping, see a mechanic.