What are the methods and standards for checking engine oil?

[StHazel]

Here is an introduction to the standard methods for checking engine oil: 1. Determine the oil level: Park the vehicle on a relatively level and flat road surface; after 10 minutes, pull out the dipstick to observe the position of the oil between the upper and lower marks on the dipstick to determine whether the oil in the oil pan needs to be topped up. Remember not to pull out the dipstick immediately after parking to check the oil level in the oil pan, as the result at this time cannot accurately reflect the actual oil level in the oil pan. 2. Do not overfill: If the oil level in the oil pan is already below the lower mark on the dipstick, it is necessary to add oil promptly. Unscrew the oil filler cap and add an appropriate amount of the same brand and grade of oil as that in the oil pan. Wait for 10 minutes, then check whether the added oil meets the requirements. The oil level should be between the upper and middle marks on the dipstick. Be sure not to add too much oil. If the oil level exceeds the upper mark on the dipstick, the engine operating in this condition may cause oil to escape from the engine breather and result in blue smoke from the exhaust pipe.

[LaJohn]

I'm an experienced driver and have developed the habit of checking the engine oil every time I refuel. After turning off the engine, wait a few minutes to allow the oil to flow back to the bottom. Park on level ground, pull out the dipstick, wipe it clean, reinsert it, then pull it out again to check the oil level. The standard is between the min and max marks, preferably in the upper-middle position. The oil should be golden and clear, not black or foamy. Rub it between your fingers to check that the viscosity is moderate and it feels smooth and lubricating. When the temperature is high, the oil level might be slightly lower, but it's fine as long as it's within the normal range. I usually check once a month, adjusting the frequency based on driving habits—more often if I take long trips frequently. This small routine helps prevent engine wear, saving money and ensuring safety. Replace the oil when it ages, following the manual's recommendation of every 5,000 kilometers—never skip it.