What will happen if you overfill your car’s oil?

Too little oil in the engine will do terrible things to the vehicle’s motion: Friction between moving parts increases, the engine can run hotter, and worst case scenario, moving parts seize up when lacking lubricant. However, bad things can also happen in cases where the engine has too much oil. Let’s find out with CarOn right away through the following article!

Why use car lubricants?

Lubricant is a mixture of base oil and additives used to lubricate the engine. Lubricant oil is also known as commercial lubricant. Whether a car engine operates well or not depends on the quality of the lubricant. Lubricants have a very important influence on the life of the engine. In addition to the main function of lubrication, lubricants also have the effect of preventing rust, cooling and cleaning the engine.


Lubricants are extremely important for cars, so you need to choose lubricants carefully, in accordance with the manufacturer’s requirements. If the type of lubricant you use is not suitable for your vehicle, your vehicle will easily have its lifespan reduced and seriously degraded. You can find a reputable lubricant dealer to help you find the right lubricant.

To understand more about lubricants and learn the secret to easily choosing the type of lubricant for your car, please read the article on how to choose the right lubricant for your car below:

Harmful effects of pouring too much car oil

Overfilling can cause foaming, turning a plain lubricant into a frothy fluid with air bubbles that reduce lubricating and cooling properties. Bubbling oil also makes it harder for the oil pump to distribute around the engine, so some moving parts may not get as much oil as they need, increasing wear and increasing the risk of engine damage, … And many other issues

Causes air bubbles to appear in the oil

If too much lubricant is poured, the excess lubricant will have no place to circulate. When the engine operates, the shaft will rotate and excess oil will mix with air to create foam. If lubricating oil foams, its lubricating ability will decrease, causing the machine to heat up. Gradually, it will lead to damage to the details in the vehicle’s engine.

Air bubbles appear in the oil

Causes heavy engine and overheating

Too much lubricant hinders the rotation of parts such as crankshafts, gears, etc., leading to increased friction between machine parts, consuming raw materials and over time leading to machine overheating, especially damage engine parts.

In addition, as mentioned above, the appearance of air bubbles in the oil will cause the oil to reduce its lubricating ability, worse, it will not be able to circulate in the machine parts, causing the engine to heat up, as well as the parts at the head. the machine is damaged.

The car engine is hot

Putting pressure on machine parts, causing the clutch to slip

There will always be a seal at the top and bottom of the crankshaft to prevent car oil from leaking out of the engine. The crankshaft is where the engine speed is measured, and it rotates rapidly whenever the engine is running. For example: If the tachometer reads 2,500 rpm at 75 mph, that means the crankshaft makes one complete revolution 2,500 times per minute; Step on the gas and it can reach 5,000 rpm or higher.

Typically, the added oil flows into a pan at the bottom of the engine, below the crankshaft. If the pan is too full, the crankshaft can act like a high-speed mixer stirring the oil and creating foam.

Not only that, this will also put a great deal of pressure on the machine parts. High pressure can cause oil to spill out. If not handled promptly, the oil will unfortunately overflow the flywheel and lead to clutch slippage.

Causes tearing of the weld and membrane

There are often many gaps and welds between engine parts, and gaskets are the parts that fill them. Excess amount of machine oil will cause the machine head to be too much to bear, putting pressure on the entire system, including the welds and gaskets, which will crack and tear, causing leaks and oil depletion.

This will cause you to soon have to add more oil or change the oil because the old oil has mixed with air and its lubricating ability is no longer effective.

Bent and broken arms

The arm is bent and deformed

Too much oil creates more friction on the crankshaft and crankshaft when in contact with the oil. If left for a long time, it will cause them to bend and, more seriously, can break.

Increases oil pressure

Overfilling also increases oil pressure, putting more pressure on seals and gaskets – which help keep oil from leaking out of the engine or going to places inside where it shouldn’t be. Over time, increased pressure will accelerate wear on the seals. At this time, the oil pressure warning light will light up.

Overfilling often occurs because repair shops pump new oil from large tanks rather than from smaller-sized tanks, making it difficult to adjust the amount of oil. Holding the pump trigger too long can easily add oil and the technician may not check with the dipstick. Even if they check, the oil takes time to flow into the pan, so they may misread the newly injected oil level.

Creates black smoke phenomenon

If too much lubricant does not leak, the excess lubricant will seep into the combustion chamber and be burned with gasoline, causing black smoke to appear in the engine’s exhaust. This condition, if not detected and corrected early, can lead to clogged air filter and turbo rupture in the engine.

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Causes environmental pollution

Too much oil can cause oil to overflow through the exhaust pipe. The task of this breather tube is to help absorb oil vapor from the crankcase and reduce the pressure created by the up and down process of the piston. Instead of releasing oil vapor outside to pollute the environment, this exhaust pipe brings oil vapor back to the combustion chamber through the air intake.

In case there is too much oil in the crankcase, the oil can run back through this pipe, entering the combustion chamber through the air intake and as a result, the intake is clogged with engine oil soot. It can be clearly seen from the above analysis that black smoke will appear from the engine exhaust. This is one of the causes of heavy environmental pollution in Vietnam today.

Xe-ra-khoi-den caron

Handbook when filling engine oil

How much oil a car needs depends on the car make and model. This is recommended by the manufacturer for each car owner, in the car’s owner’s manual or you can simply search for this information on the Internet. Typically, engines require between 4 and 6 liters.

Therefore, it is necessary to have a plan to periodically change car oil to ensure smooth operation of the car, increase the life of the car and be safe for ourselves. Some things to keep in mind when pouring engine oil are:

Refer to the viscosity measurement handbook

Before putting oil in the tank, you need to look at the manual that specifies how much oil to use for that type of vehicle. Besides, you should use a dipstick to estimate the level of oil poured into the tank. Be careful to carefully check the amount of oil in the car when changing the oil. The amount of oil must always be between the max and min levels of the oil probe. Checking the oil dipstick when the vehicle is running on level ground and the engine is cold will give an accurate reading of the level.

  • If the oil level is a little higher than full, it won’t cause any problems.
  • If you add about 1 quart, it’s still acceptable.
  • If there is an excess of 2 quartz, it is too much; up to 3 quartz will cause serious damage.

Choose quality car engine oil

Besides adding the right amount of engine oil, choosing the right and high-quality lubricant will help your engine operate at its best.

You should choose to buy genuine distributed quality oils if you want to change your own oil at home. However, we recommend that you still take your car to a reputable garage to change the oil. You can rest assured about the quality, you don’t have to think twice about the price, and you don’t have to worry about preparing supplies.

CarOn Pro is one of the names worth your attention. As one of the brands that thrives on quality, bringing your car to CarOn means you have chosen for yourself the most optimal, effective and quality-assured solution on the market.

Handling when pouring excess engine oil

In case you overfill with excess oil, jack the car up, then get under the car to remove the drain plug located at the bottom of the engine oil tank. Be sure to slowly withdraw the oil so that it flows out little by little. Check the oil dipstick, if it is over half a liter or more or foam appears on the dipstick, the best fix is ​​to drain all the oil and refill the oil to the appropriate level. Usually this is done by a garage technician, but if you change the oil at home, you can completely handle it yourself in some of the above ways.

Adding too much lubricant to your car will lead to serious damage to the car. Therefore, this is one of the items that needs more careful care than ever.

For any questions about CarOn’s products and services, please contact hotline 0961.247.360 or via website: https://caronpro.vn/ for quick consulting support!

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