Does adding 0.5 liters more engine oil affect the engine?

[BrantleyDella]

Excess engine oil needs to be drained out. Adding too much oil increases the engine's operating resistance, affects the vehicle's fuel consumption, increases engine noise, and raises the crankcase oil pressure. In severe cases, it can lead to oil burning. The following are the functions of engine oil: 1. Friction reduction: A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby reducing wear. 2. Sealing: Engine oil can form a seal between the piston rings and the piston, reducing gas leakage and preventing external contaminants from entering. 3. Anti-rust: Lubricating oil adheres to the surface of parts, preventing contact with water, air, acidic substances, and harmful gases. 4. Cushioning: When the pressure in the engine cylinder rises sharply, suddenly increasing the load on the piston, piston skirt, connecting rod, and crankshaft bearings, this load is transmitted and lubricated through the bearings, cushioning the impact load. 5. Cleaning: Good engine oil can carry carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank through circulation, washing away dirt generated on the working surfaces of the parts through the flow of the lubricating oil.

[DiHeidi]

I think adding an extra 0.5 liters of engine oil can indeed cause some trouble for the engine. The role of engine oil is to lubricate and cool internal components, and overfilling can lead to excessively high oil levels. When the engine is running, the high-speed rotation of the crankshaft will agitate the oil, creating a large number of bubbles and foam. These foams have no lubricating effect, which may result in dry friction between components and accelerate wear. In severe cases, it can cause engine overheating, increased noise, and even damage to seals, leading to oil leaks. Over time, this will affect the engine's lifespan and may also increase fuel consumption. My suggestion is to always check with the dipstick after each oil change to ensure the oil level is between the min and max marks. If you accidentally overfill, you can use a thin tube to siphon out some oil or seek professional help. This small habit can save you a lot of money in the long run and avoid expensive repairs.

[DelLillian]

Once I helped a friend change his engine oil, and he carelessly added half a liter extra. Within two days of driving, he complained about harsh engine noises and unstable idling. At the repair shop, the mechanic pointed out the oil level was too high, causing excessive foaming that reduced lubrication efficiency and increased crankcase pressure, potentially leading to oil entering the combustion chamber and producing smoke. After promptly draining the excess oil, the issues disappeared. Since then, I've reminded myself: it's better to slightly underfill than overfill. Different car models have varying tolerances, with older engines being more sensitive. An extra 0.5 liters might not cause immediate problems, but long-term overfilling can corrode components or increase maintenance risks. Regularly checking the dipstick develops good habits to nip problems in the bud.

[BeauMarie]

From the basic function of engine oil, adding an extra 0.5 liters can raise the oil level too high. When the engine is running, the oil will be violently agitated, creating air bubbles, which weakens lubrication capability. Friction between components increases, accelerating wear, and may also lead to engine overheating or increased oil consumption. Some vehicles have sensor warnings, but most do not, requiring manual checks with the dipstick to confirm. In the short term, there may not be significant issues, but prolonged accumulation can affect engine performance, such as aging of valve seals or abnormal oil pressure. It's best to maintain the precise amount to avoid risks.