What is the optimal position to fill engine oil on the dipstick?
2 Answers
It is most appropriate to fill the engine oil slightly above the midpoint between the lower and upper limit lines on the dipstick. Dipstick markings: There are two markings on the dipstick: a maximum mark and a minimum mark. The normal oil level should not be above the maximum mark or below the minimum mark. The normal range is between these two marks. Method for checking oil level: After adding oil, start the vehicle and then check the oil level 3 minutes after turning off the engine. This is because when changing the oil, the oil filter also needs to be replaced. The new oil filter initially contains no oil, and oil will flow into it after starting the vehicle. Waiting 3 minutes allows the oil to settle in the oil pan. This method ensures a more accurate oil level reading. Note that you should not check the oil level on a slope, as the tilted position of the vehicle will cause the oil in the oil pan to tilt as well, resulting in an inaccurate reading.
I remember the mechanic specifically emphasized during the last car maintenance that the ideal oil level on the dipstick is slightly above the middle, roughly at the three-quarter point between the minimum and maximum marks. If the oil level is too low, the engine won't be properly lubricated, leading to increased wear on components. However, exceeding the maximum mark by too much is even more problematic—excess oil can be churned by the crankshaft, creating foam that reduces lubrication efficiency and may cause oil seal leaks. My personal routine is to check the oil when the engine is cold: turn off the engine, wait five minutes, pull out the dipstick, wipe it clean, reinsert it fully, and then take the measurement for accuracy. After every oil change, I recheck the level after a few days to ensure it stays within the optimal zone, balancing engine protection and fuel efficiency.
