What are the effects of overfilling engine oil on the engine?
2 Answers
The effects of overfilling engine oil are as follows: 1. Impact on the engine: It can severely damage the three-way catalytic converter and may also cause the engine to lose oil, which reduces engine power and creates unnecessary crankshaft rotation resistance, affecting performance. This, in turn, increases fuel consumption. 2. Excessive oil reduces engine power: When the engine is running, the big end of the crankshaft and the connecting rod move rapidly. If too much oil is added, the crankshaft and connecting rod will churn vigorously, consuming energy and increasing fuel consumption. Additionally, excessive oil dilution can cause the vehicle to feel sluggish, become less responsive, and increase noise. 3. Excessive oil can cause blue smoke in the engine exhaust pipe: With too much oil, the rapid movement of the crankshaft and connecting rod inevitably leads to oil splashing. A large amount of splashed oil will enter the combustion chamber, resulting in blue smoke emissions from the exhaust.
As a seasoned driver with over a decade of experience, I've encountered the issue of overfilled engine oil. After an oil change back then, my car felt underpowered and fuel consumption skyrocketed. Later inspection revealed that excessive oil caused the crankshaft to churn and create foam, drastically reducing lubrication effectiveness and accelerating engine component wear. In severe cases, increased crankshaft pressure led to oil seal rupture and leakage, with white smoke even coming from the exhaust pipe. The repair cost me considerable effort and money. Since then, I've developed a habit: always checking the manual before adding oil, adding appropriate amounts, running the engine for five minutes after refilling before shutting it off, then using the dipstick to verify the oil level stays between the min-max marks. Regular maintenance shouldn't be neglected - using the correct oil quantity protects the engine, extends vehicle lifespan, and prevents unnecessary troubles and expenses.
