How is the engine oil level typically checked?

The procedure for checking the engine oil level involves using the dipstick, which is specifically designed for this purpose. First, the dipstick is pulled out and wiped clean to remove any oil that may have adhered to it, ensuring an accurate reading. After reinserting the dipstick fully back into the tube, it is then pulled out again to check the oil level indicated on the dipstick. This level will show if the oil is within the acceptable range, providing a reliable assessment of the engine's oil status.

The other methods mentioned do not provide the accurate and standardized means of checking oil levels as defined by typical automotive practices. Observing the level in the oil reservoir directly could lead to misinterpretation, as the reservoir might not represent the true oil level in the engine, particularly if the engine has not been running or is not level. Adding oil until it reaches the top of the filler neck may result in overfilling, which can damage the engine or cause oil to foam and be ineffective. Using a pressure gauge to measure oil flow does not relate to the oil level; it indicates oil circulation and pressure, which is entirely different from checking how much oil is present in the engine.