Is it a problem if the engine oil slightly exceeds the upper limit?
3 Answers
It is problematic if the engine oil slightly exceeds the upper limit. This can increase the rotational resistance of the crankshaft, reduce the engine's output power, and lead to oil burning and blue smoke as the oil enters the combustion chamber through the piston rings. Additionally, it can damage the three-way catalytic converter, increase fuel consumption, accelerate wear on the cylinders and pistons, and reduce the vehicle's lifespan. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. Engine oil consists of two main components: base oil and additives. The base oil is the primary component of the lubricant, determining its basic properties, while additives compensate for and improve any deficiencies in the base oil's performance, making them an essential part of the lubricant.
I've been driving for over twenty years and take engine oil very seriously. Exceeding the oil level slightly might seem harmless at first glance, but it actually carries potential risks. When the engine is running, the oil can form bubbles, increasing oil pressure, which may damage oil seals and gaskets. Over time, this can lead to oil leaks or engine damage. Once, I noticed a slight overfill during a check and didn’t pay much attention, but soon after, the oil warning light came on. Fortunately, I got it fixed in time. I recommend checking the dipstick regularly when the engine is cold to ensure the oil level stays between the marks. If you accidentally add too much oil, you can drain some out or drive to a service center for assistance. In short, don’t take it lightly—safety first. Avoid long-term overfilling to prevent increased fuel consumption.
I enjoy doing DIY car maintenance, and often encounter situations where the engine oil slightly exceeds the upper limit. The main issue is that it may increase internal engine resistance, leading to greater friction, reduced power efficiency, and even higher fuel consumption. Normally, the dipstick has a MAX and MIN line, and as long as it doesn't exceed too much, it's generally fine. However, it's important to check under the right conditions: only when the car is parked and cold for accurate readings. If it's over the limit, it's best to either extract some oil or have it drained at a shop. Also, a reminder to everyone: when adding new oil, pour it slowly and don't rush to avoid overfilling—I've made this mistake myself due to carelessness, which later led to higher fuel consumption, so I've had to change my habits. It's advisable to develop a routine of regularly checking the engine oil to catch and address issues early.
