Check your oil by pulling the dipstick, wiping it clean, reinserting it fully, then reading where the oil level sits

Checking your oil takes about two minutes and tells you whether you have enough to run safely until your next oil change. You do not need special tools — just a rag or paper towel. The dipstick is already in your engine; you pull it out, wipe it, put it back in, and read the mark.

Most cars need checking once a month or before a long drive. Some newer vehicles have electronic oil monitors instead of a dipstick, so check your owner's manual first. If your car has a dipstick, the process is the same whether you drive a sedan, truck, or SUV.

Key Takeaways

  • Park on level ground and wait at least five minutes after turning off the engine so oil settles into the pan and gives you an accurate reading.
  • Pull the dipstick straight out, wipe it completely clean on a rag, reinsert it all the way until it seats, then pull it out again to read the level.
  • Oil should reach the "full" mark or the upper dot on the dipstick; if it is below the "low" mark or lower dot, add the type of oil your manual specifies.
  • Check your oil when the engine is cold for the most accurate result, though you can also check it a few minutes after driving if the engine is warm but not hot.

Where to find the dipstick under your hood

Open your hood and look for a long, thin handle sticking up from the engine block. The handle is usually yellow, orange, or red and has a loop or knob at the top. This is the dipstick. If you cannot spot it, your owner's manual has a diagram showing its exact location — different engines place it in different spots.

Once you locate it, you are ready to check. The whole process happens in one spot; you do not need to move around the engine or remove other parts.

The step-by-step process

Step 1: Park on level ground and let the engine cool. Pull into a flat spot and turn off the engine. Wait at least five minutes. Oil needs time to drain back into the pan at the bottom of the engine. If you check while oil is still running through the engine, the reading will be too low and misleading.

Step 2: Pull the dipstick straight out. Grab the handle firmly and pull straight up. It should slide out smoothly. If it sticks, wiggle it gently side to side as you pull.

Step 3: Wipe the dipstick completely clean. Use a rag, paper towel, or old cloth. Wipe from the base to the tip until no oil residue remains. You need to see the clean metal underneath so you can read the new oil level accurately.

Step 4: Reinsert the dipstick all the way. Push it back into its tube until you feel it seat at the bottom. It should go in smoothly and stop when it reaches the proper depth. Do not force it.

Step 5: Pull it out again and read the level. Remove the dipstick and look at where the oil clings to the metal. The dipstick has two marks: a "low" mark (or lower dot) and a "full" mark (or upper dot). The oil should reach the full mark or somewhere between the two marks. If it is below the low mark, you need to add oil.

What the oil level marks mean

The two marks on your dipstick represent the safe operating range. Oil expands when warm and contracts when cold, so the range gives you a buffer. Between the marks is safe. At the full mark is ideal.

If the oil is below the low mark, your engine does not have enough oil circulating to protect moving parts. Low oil can cause engine damage over time. If the oil is above the full mark, excess oil can foam inside the engine and lose its protective ability. Both extremes are worth correcting, though running slightly low is more common as engines age and burn small amounts of oil naturally.

Adding oil if the level is low

If your dipstick shows the level is below the low mark, you will need to add oil. Check your owner's manual or look under the hood for a cap labeled "Oil" or showing an oil can symbol. This is the oil filler cap, usually on top of the engine.

Unscrew the cap and set it aside. Pour the correct type of oil slowly into the opening. Your manual specifies the type — common grades are 5W-30 or 10W-40, but yours may differ. Add a small amount, wait a minute for it to drain down, then check the dipstick again. Repeat until the level reaches the full mark. Screw the cap back on tightly.

Do not overfill. It is easier to add a little more oil than to remove excess, so go slowly. Most engines hold between four and six quarts total, but you typically add only a quart or less at a time when topping off.

When to check and what to watch for

Check your oil once a month as part of routine maintenance, or before a long road trip. If you notice the level dropping quickly — needing a quart every few hundred miles — that signals a leak or internal burn that needs attention from a mechanic. A slow, gradual drop over thousands of miles is normal for older engines.

Also watch the color of the oil on the dipstick. Fresh oil is amber or light brown. Dark brown or black oil means it is due for a change soon, even if the level is still full. Milky or foamy oil suggests water is mixing in, which points to a problem worth having checked.

Checking oil in newer cars with electronic monitors

Some cars built in the last ten years do not have a traditional dipstick. Instead, they have an electronic oil level sensor that displays the level on your dashboard or infotainment screen. Check your owner's manual to see if yours is one of these. If so, you check the level through the vehicle's menu system rather than by hand.

Even with an electronic monitor, the same rule applies: if the level is low, you add the correct oil type through the filler cap. The process is identical; only the reading method changes.

Frequently Asked Questions

Can I check the oil while the engine is warm or hot?

You can, but the reading will be less accurate. Oil expands when warm, so a warm engine will show a higher level than the true amount. For the most reliable reading, check when the engine is cold — first thing in the morning before you drive, or at least five minutes after turning it off. If you must check a warm engine, be aware the level may drop slightly once the oil cools.

What if the dipstick is stuck or hard to pull out?

Wiggle it gently from side to side as you pull upward. If it still resists, do not force it — you could break it. Let the engine cool completely and try again. If it remains stuck after cooling, a mechanic can help. A stuck dipstick is rare but can happen if oil has hardened around the tube.

How often should I check my oil?

Once a month is standard for most cars. If you drive a lot, tow a trailer, or have an older vehicle, check every two weeks. If you notice oil dropping between checks, check more often to catch a leak early. Your owner's manual may recommend a specific interval.

Do I need to check the oil if my car has a low-oil warning light?

The warning light tells you the level is critically low, but checking the dipstick yourself gives you a clearer picture of how much oil you actually have. The light is a safety net, not a replacement for regular checks. Checking by hand lets you catch a slow leak before the light comes on.

What type of oil should I add if the level is low?

Always use the type specified in your owner's manual. Common types are 5W-30, 10W-40, and 0W-20, but yours may be different. The manual is usually in your glove box or available online by searching your vehicle's year, make, and model. Using the wrong type can affect engine performance and protection.