
You put oil in your car through the oil filler cap, which is located on top of the engine. It’s typically a black or colored twist-off cap labeled with an oil can symbol. To find it, open your hood and look for the cap on the valve cover, a metal or plastic part sitting on top of the engine block. The engine's dipstick, used to check oil level, is usually nearby but is not where you add oil.
Before adding oil, ensure the engine is cool and the car is parked on a level surface. Unscrew the oil filler cap, place a funnel in the opening to avoid spills, and add the correct type and amount of oil specified in your owner’s manual. Overfilling can cause serious damage. After adding, screw the cap back on securely, run the engine for a minute, then recheck the level with the dipstick to ensure it's between the "Min" and "Max" marks.
| Common Engine Oil Viscosity Grades by Climate | Typical Use Case | Key Characteristic |
|---|---|---|
| 0W-20, 5W-20, 5W-30 | Most modern cars in the U.S. | Excellent cold-weather starting and fuel efficiency |
| 10W-30 | Older vehicles or warmer climates | Thicker at high temperatures for engine protection |
| 0W-16, 0W-8 | Latest high-efficiency engines (e.g., , Honda) | Very thin oil for maximum fuel economy |
| 5W-40, 10W-40 | High-performance European cars or turbocharged engines | Enhanced high-temperature stability |
Always consult your vehicle’s owner’s manual for the exact oil specification. Using the wrong oil can affect performance and void your warranty.

Pop the hood and look for a twist-off cap on the engine itself, usually with a little oil can icon on it. That’s your spot. It’s not the dipstick—that’s just for checking the level. Make sure the engine isn't hot, use a funnel to keep things clean, and add a little at a time. Check the dipstick after each addition so you don’t overfill it. Your car’s manual will tell you exactly what kind of oil to use.

I always tell my neighbors to think of it like this: the engine has a "mouth" for oil. Open the hood and find the cap that looks like it should have an oil can symbol. It screws off. The key is to never add oil near the dipstick ; that’s a common mistake. Just pour slowly into the correct filler hole with a funnel. If you’re unsure, a quick search for "[Your Car Model Year] oil filler cap location" on YouTube will show you exactly where it is visually.

Safety first. Park on a flat surface and let the engine cool down completely. Locate the oil filler cap—it’s almost always on the top of the engine. Before you pour, wipe away any dirt or debris around the cap to prevent it from falling into the engine. Using a clean funnel is non-negotiable for a clean pour. Add oil in small increments, checking the dipstick frequently. The goal is to get the level to the full mark, not beyond it. Overfilling is as bad as having too little.

Beyond just finding the cap, it’s about doing it right. The owner’s manual is your best friend here; it has the specific oil type and capacity. The filler cap is your target. After adding oil, don’t just slam the hood shut. Start the engine and let it run for about 30 seconds. This circulates the new oil. Then, turn it off, wait a minute for the oil to settle back into the pan, and do a final, accurate check with the dipstick. This ensures you get a true reading.


