What Phenomena Can Be Caused by Excessive Engine Oil?

1 Answers
McChristopher
07/30/25 7:57am
Excessive engine oil in a car can lead to the following phenomena: 1. It reduces the engine's output power. When the engine is running, the crankshaft and connecting rod big end move rapidly. If there is too much oil, the crankshaft and connecting rod will churn the oil violently. This churning consumes a certain amount of energy, which indirectly reduces the engine's output power and increases fuel consumption. 2. It causes the engine's exhaust pipe to emit blue smoke. Excessive oil will inevitably lead to oil splashing due to the rapid movement of the crankshaft and connecting rod big end. A large amount of splashed oil can enter the combustion chamber and burn, resulting in blue smoke from the exhaust pipe, commonly known as "oil burning." "Oil burning" is also a method to determine excessive fuel consumption. 3. It can cause piston ring seizure, fuel injector clogging, and other faults. A large amount of oil entering the combustion chamber can burn and form carbon deposits on the piston rings, piston top valve seats, and fuel injectors. This can lead to piston ring seizure, fuel injector clogging, and increased wear between the piston and cylinder. Additionally, excessive carbon deposits can cause engine knocking. 4. It can easily lead to crankcase explosion. Excessive oil levels can generate oil vapor when churned by the connecting rod big end. This vapor can ignite when exposed to high temperatures, causing a crankcase explosion, which is a severe consequence. 5. It can cause oil leakage. Excessive oil increases the pressure in the lubrication system, making oil seals more prone to damage and leading to oil leakage. Leakage, especially at the front and rear ends of the crankshaft, increases oil consumption, pollutes the environment, and complicates maintenance. 6. It increases wear and reduces lubrication performance. The crankshaft churns the excessive oil, which not only splashes the oil but also creates air bubbles. Oil with bubbles entering the lubrication system can cause wear on the cylinder and piston. 7. It can lead to oil degradation and reduced performance. Excessive oil is easily heated when churned by the crankshaft, causing the oil to degrade and lose its performance. Therefore, adding too much oil is not beneficial, and it is best to drain some out.
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