The oil goes into the oil fill cap, which is located on the top of your engine. It's typically a black or yellow twist-off cap marked with an oil can symbol. The most accurate way to find it is to consult your vehicle's owner's manual. Before adding any oil, it's critical to check the current oil level using the dipstick to avoid overfilling, which can damage the engine.
Locating the Oil Fill Cap
Pop open your car's hood and secure it with the prop rod. Stand facing the engine bay. You're looking for a cap (usually about the size of a large soda bottle cap) on one of the engine's valve covers. It's often black but is frequently brightly colored—yellow is very common—for easy identification. The universal symbol for engine oil is an oil can, which is almost always printed on or molded into the cap. If you see a cap labeled "Oil" or with that symbol, you've found it. If you're unsure, your owner's manual has a diagram that labels every component under the hood.
Safety First: Checking the Dipstick
Never add oil without first checking the level. The engine should be off and cool. Pull out the dipstick (a long, thin metal loop, often with a yellow or orange handle), wipe it clean with a rag, reinsert it fully, and then pull it out again to get an accurate reading. There will be markings for "Full" and "Add." Your goal is to add oil slowly, in small increments (usually half a quart at a time), to bring the level up to the "Full" mark. Overfilling can cause serious and expensive damage to engine seals and components.
| Common Engine Oil Types and Viscosities | Typical Cost (Quart) | Ideal For |
|---|
| 0W-20 Synthetic | $8 - $12 | Most modern gasoline engines, especially in colder climates |
| 5W-30 Conventional | $5 - $8 | Older model vehicles, moderate climates |
| 5W-30 Full Synthetic | $9 - $15 | High-performance engines, extended drain intervals |
| 10W-40 High Mileage | $7 - $10 | Engines with over 75,000 miles to reduce oil consumption |
