How to Read the Engine Oil Dipstick?
4 Answers
Method for reading the engine oil dipstick: The dipstick has an upper limit and a lower limit. When the engine oil level is between these two marks, it indicates the oil quantity is normal and can continue to be used. If the oil level exceeds the upper limit, it may lead to increased carbon deposits. Conversely, if the oil level reaches the lower limit, it can cause engine misfire and, over time, affect the engine's lifespan. To check the oil, ensure the engine is stopped, the car is parked on level ground, and the handbrake is engaged. Then, start the engine and wait until it reaches normal operating temperature before turning it off. Allow the lubricating oil to return to the oil pan before proceeding with the next steps.
My habit is to wait ten minutes after turning off the engine before checking the oil dipstick, as it's particularly easy to misjudge the oil level. Open the hood and locate the metal strip with a ring, then wipe it clean before reinserting and pulling it out again. At this point, observing where the oil reaches is crucial: there are two raised dots or marked lines at the top of the dipstick, and the oil should ideally stay at three-quarters of the way between these two marks. If the oil level is too close to the lower limit, you'll need to top it up. Last winter, I once found the oil was nearly depleted after running mountain roads for five consecutive days without realizing it. On the other hand, if the oil level exceeds the upper limit right after maintenance, it can cause trouble, potentially leading to a leaking valve cover gasket. Also, pay attention to the oil color: golden yellow means it's still good, but if it's as black as asphalt, it's time to consider changing it.
I have a fixed habit of checking the engine oil every Sunday morning. It's essential to ensure the car is parked on level ground, as the oil level is most accurate before driving in the morning. When pulling out the dipstick, it must be done vertically; pulling it at an angle can skew the oil mark. Older German cars often require two methods for dipstick insertion: the T-shaped one needs to be turned a quarter turn before pulling out, while many Japanese cars allow direct removal. If the dipstick is covered in foam, it's particularly alarming, indicating emulsified and deteriorated oil, likely due to a blown head gasket leaking coolant. Before long summer trips, paying extra attention to the oil level is crucial. Last month, I added 300 milliliters before driving to Xinjiang, and upon return, I noticed the dipstick level had dropped exactly 5 millimeters—oil consumption is especially rapid at high altitudes.
Actually, the oil dipstick has a secret scale identification method. I've specifically studied the dipsticks of different car models: the L-shaped elbow offers more operating space, suitable for those with thicker fingers. If you see MAX/MIN letters with grid lines in between, they are the easiest to identify. When checking the oil level on a cold engine, the oil film will have fully drained back, but right after turning off a hot engine, the oil may not cling to the dipstick, leading to misjudgment. When unscrewing the oil cap to add oil, don't be greedy; the spout cap on the new oil bottle should only allow adding up to 100 milliliters before stopping. Wait half an hour before rechecking. If you've added too much, you'll have to visit a car repair shop to have it extracted, as doing it yourself is too much trouble.
