When checking the oil level in an engine with an oil fill plug, the oil level should be?

When checking the oil level in an engine with an oil fill plug, the oil level should indeed be at the top of the plug opening. This ensures that the engine has sufficient oil for proper lubrication and functioning. Having the oil level at the top of the plug indicates that the oil system is full enough to effectively circulate oil throughout the engine, which is crucial for preventing wear and tear on engine components.

If the oil level is below the plug opening, it could signify that the engine is low on oil, potentially leading to inadequate lubrication and increasing the risk of engine damage. Conversely, if the oil level is above the plug opening, it can indicate overfilling, which may cause foaming of the oil or pressure leaks, also detrimental to engine performance. Therefore, maintaining the oil at the correct level, at the top of the plug opening, is essential for ensuring optimal engine operation and longevity.