Engine oil level directly affects the life of your car’s engine. Too little or too much engine oil can cause damage and affect vehicle performance.


According to the survey, many people think that they often pour or add more than the specified level when performing an oil change, they think “excess is better than lack”. However, anything too much is not good. And pouring too much oil, exceeding the specified level each time, will have unpredictable consequences. Let’s go with Hawaii Oil to find out the serious consequences of changing the excess lubricant in the car engine, let’s follow along!

1. The importance of lubricants for car engines



Automotive lubricants not only have the effect of lubricating, helping the piston to move up and down gently and smoothly in the cylinder, but also have the following uses:

  • Cooling – When the car engine is running, the heat released from the fuel combustion is very large. Thanks to the continuous circulation process, the oil will have a cooling effect, preventing the engine from overheating or burning the piston.
  • Cleaning – The process of burning fuel will naturally produce soot deposited in the engine, the next use of the oil is to wash away and clean these soot.
  • Sealing – When the engine is running, the oil acts as an amorphous soft cushion that seals the gap between the piston and the cylinder wall so that the pressure generated during fuel combustion is not lost.
  • Anti-rust – The surface of metal parts in the engine is covered with a thin film of lubricant that limits contact with the air, avoiding oxidation leading to rust.

The engine is made up of many metal parts such as pistons, camshafts, valves, etc. When the engine is in operation, the friction between these parts is very large. The pump system will spray lubricant into every corner of the engine to form a smooth cushion on the contact surface between the parts, reducing friction and increasing operating efficiency. At the same time, limiting direct contact between parts helps to minimize wear on metal surfaces, which protects and increases the life of the engine.


To obtain an effective lubrication solution for automotive engine systems. Lubricants manufacturers have had to spend a lot of time and effort to research the most suitable and best products. Can meet international standards, meet the strict requirements of car manufacturers.

With the socio-economic development, today’s cars operate in increasingly harsh conditions and the requirements for durability increase. As engine oil becomes more important, using the right oil for your vehicle’s engine can provide maximum protection under severe operating conditions.

With that mentality, every time it comes to the oil change cycle, consumers often intentionally add a little extra. In order to realize the idea of helping the car to be better protected. Without knowing it, it is a taboo that causes great damage to the car engine.

2. The “bitter fruit” when pouring excess oil in the car engine


Overfilling lubricating oil for normal car engines will only cause overheating in the case of a little excess. However, if it is too much, it will have dire consequences. Specifically, overfilling engine oil can cause the following harms:

Overfilling of oil leads to overheating of the engine

When overfilling, exceeding the level specified in the manual, the excess oil has no room to circulate. So, when the engine is running, the shaft rotates, the excess oil will be mixed with the air. And foam appears. Foamy lubricants cannot do a good job of lubricating machine parts.



That situation goes on for a long time, leading to overheating, even gradually damaging parts in the car engine.If too much oil does not leak, this excess oil will bubble up into the combustion chamber and burn with gasoline, causing smoke to appear due to burning of lubricating oil with a bluish white color. This situation, if not detected and rectified early, can lead to clogged air filter and turbocharger failure for vehicles using turbochargers.

Excess oil will enter the combustion chamber causing blue smoke

If too much oil does not leak, this excess oil will bubble up into the combustion chamber and burn with gasoline, causing smoke to appear due to burning of lubricating oil with a bluish white color. This situation, if not detected and rectified early, can lead to clogged air filter and turbocharger failure for vehicles using turbochargers. 



                Pouring car engine oil residue will cause cars to emit blue smoke

Torn engine

The motor has the effect of sealing the gaps between the parts. But when pouring oil too much, exceeding the tolerance of the locomotive will create pressure to tear and crack the seals. An oil leak occurs. When these seals are cracked, open will cause oil shortage. Shorten your oil change cycle, forcing you to change or add new oil constantly.

Overfilling with oil causes bends and broken arms


It is not only water that enters the engine that causes broken and bent arm. But even the great resistance from the excess oil causes the crankshaft and sidearm to suffer more friction when in contact with the oil. Making them can be bent and more seriously can cause the machine to break.

Pouring a lot of lubricating oil will cause overflow through the exhaust pipe, polluting the environment

Too much oil will push up the pressure in the crankcase, which can cause oil to spill through the vent. The role of this vent pipe is to help draw out the oil vapor in the crankcase and reduce the pressure created by the up and down process of the piston. Instead, the oil vapor is discharged out causing environmental pollution, this exhaust pipe brings the oil vapor back to the combustion chamber through the air intake manifold. In the event that there is too much oil in the crankcase, the oil can flow back through this pipe, entering the combustion chamber through the intake manifold. As a result, the suction neck is clogged due to engine oil soot.

Overfilling oil can cause clutch slip

There are seals at the top and bottom of the crankshaft to prevent oil from leaking out of the engine. If the engine is filled with too much oil, too much oil will cause the pressure inside the engine to increase. As a result, the oil inside the engine will put a lot of pressure on the crankshaft end and end seals, which are quite fragile and easily cause oil to spill out of the engine.

According to car maintenance experts, the more dangerous thing that can happen here is that the oil can spill over the flywheel and cause the clutch to slip.

3. How to handle when pouring too much oil

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Overfilling the car with oil will lead to serious damage to the car. Therefore, when pouring oil for the car engine, it is necessary to pay attention to the following things:

  • Before adding oil, it is necessary to consult the manual to know how much oil to use for your “love car”. While filling the oil, use the dipstick to check the oil level in the tank.
  • When you have overfilled, remove the oil from the vehicle immediately using a 3- to 4-inch wrench and a small basin. Bend under the car, find the position of the oil screw, open the oil screw to let the oil out. Before that, remember to put the oil basin down below the oil screw. Next, you have to wait for the excess oil to drain and then screw the screw back in place.

The job is not difficult, just takes a little more time to process. But certain risks can be avoided.


Through the article that Hawaii Oil has shared, hopefully it will be useful information for readers to understand the harmful effects of overfilling the oil that can cause serious consequences affecting the life of the engine. automobile engine. Therefore, you need to pay more attention when changing car engine oil to avoid unnecessary damage!

If you are learning or needing to use car engine oil, please contact the hotline below for advice and support as soon as possible:


Hawaii oil is a manufacturer and distributor of advanced quality lubricants and grease for vehicles and cars, industrial, hydraulic and maritime through out the world.