What are the hazards of overfilling engine oil?
2 Answers
The hazards of overfilling engine oil include: 1. Reducing the lifespan of oil seals, which can lead to engine oil leaks; 2. When the engine cylinder block is overly saturated with oil, it creates unnecessary resistance to the crankshaft's rotation, affecting power output and increasing fuel consumption; 3. If the engine oil exceeds the standard level, the crankshaft's rotation will churn the oil, producing a large number of bubbles. These bubbles can enter the combustion chamber through the ventilation system, leading to what is commonly known as oil burning; 4. Worsening exhaust emissions, severely affecting the lifespan of the catalytic converter, and potentially causing direct damage to it; 5. A significant increase in the amount of oil entering the combustion chamber, leading to more carbon deposits in the chamber, increasing piston movement resistance, and reducing engine power. Therefore, overfilling engine oil is not beneficial, but adding too little is also not advisable as it can cause insufficient lubrication and result in wear.
Last time I changed the engine oil myself while driving, and accidentally added about one liter too much. As a result, the car didn't feel right when driving. The RPM became unstable, and the engine noise increased. Later, I learned that excessive engine oil increases internal pressure in the engine, which can cause the oil to spray out, polluting the environment or damaging the seals. Even worse, the oil is prone to foaming, reducing its lubrication effectiveness, and accelerating engine wear over time. Fuel consumption also increases, wasting money unnecessarily. I remember going to the repair shop that time, and the mechanic said the issue was resolved only after draining the excess oil. During regular maintenance, always use the oil dipstick to check the oil level and avoid exceeding the upper limit line to prevent small issues from turning into big troubles.
