Knowledge Post: The misunderstanding of car oil replacement is here

Text/Xu Lanxin

carThe oil is very important, so for those who only drive without refueling, it is even more difficult to change the oil and add the oil. That is because he still doesn’t know the importance of the oil to the car, and the car oil is also equivalent to the engine. My heart, if you don’t change well, you won’t be able to hit the car. This is not my alarmist talk. Automobile oil is the blood that sustains the life of the engine. It is a component that can cool and lubricate the engine. Now, more and more car owners realize the importance of engine oil, but they know little about the correct use of engine oil. Most people have certain misunderstandings about car oil, so let's take a look at the misunderstandings.

1. I will change the oil as soon as the oil is dark

Many times, we will notice that the engine oil has turned black. Does this mean that the oil has deteriorated?Although engine oil works under high temperature conditions, it is easier to oxidize and deteriorate, but withlubricating oilWith the continuous improvement of quality, especially the use of multi-grade oil, the blackening of engine oil does not necessarily mean that it has deteriorated. There are two reasons for the blackening of the engine oil: after adding new engine oil, the sludge and carbon deposits on the previous parts will be dispersed in the engine oil, and it will not take long for the engine oil to become black.

2. Only add is not changed

If the oil is not replaced for a long time, the viscosity of the oil will decrease, and it will not be able to form a lubricating protective film on the outer wall of the parts. Therefore, once the lubricity of the oil is reduced, it will directly lead to aggravated wear of the parts. Once the oil can't play a lubricating effect, it is just ordinary grease with impurities. When the parts are lubricated, the lubrication effect is not good. After the parts are rubbed, heat will be generated. Because the oil has expired, the oil will slowly be The heat energy evaporates, and the oil will become less and less over time, and then the engine will blow up without the oil lubrication, so the result of not changing the oil for a long time is very terrible. When you only add new oil to the oil without pumping out the old one, the performance of the oil will gradually decline due to pollution, oxidation and other reasons during use, and there will be some consumption at the same time. Replenishment without replacement can only make up for the lack of oil, but cannot make up for the loss of oil lubrication performance.

3. I would rather add more than less

The amount of oil should be slightly lower than the scale on the oil dipstick, too much oil will increaseCrankshaftThe rotation resistance of the engine reduces the output power of the engine, and the excessive oil will enter the combustion chamber to participate in the combustion, causing the vehicle to burn engine oil, emit blue smoke, and even increase fuel consumption.

When adding lubricating oil, be sure to keep it slightly below the scale on the oil dipstick. In addition, it is necessary to grasp many factors such as oil model, season, climate, engine displacement, technical performance and so on. Therefore, it is best to choose a professional car maintenance center, after careful judgment on the car, select the appropriate engine oil, and carefully operate the maintenance process to prevent hidden troubles.

It is believed that adding more oil to the engine is better than less, and adding less is easy to burn the bearings, and adding more oil does not matter. In fact, adding more oil will still cause harm to the engine, especially the inclined engine and the V-type engine.It increasesCrankshaft, The rotation resistance of the connecting rod increases the oil splashing on the cylinder wall, which causes the increase of carbon deposits in the combustion chamber. Therefore, adding more oil will reduce engine power, increase wear and tear, and cause excessive emissions.

4. The thinner the oil, the better

It is difficult for us to determine whether the engine oil should be changed with the naked eye or touch, but after long-term use, the engine oil will accumulate a lot of impurities. If the new oil is not replaced in time, these impurities will wear out the engine for a long time and shorten the life of the car.

We have to choose a good engine oil to make the car more durable and more dynamic. We should pay attention to the following four elements when choosing car oil:

(1) The choice of engine oil should be selected according to the requirements of the engine. It is not necessary to use too high-grade engine oil on engines with lower requirements, and it is not necessary to use lower-grade engine oils on engines with higher requirements.

(2) Multi-grade oil should be selected as far as possible. Multi-grade oil has better protection for the engine due to its saving, long life and high efficiency. Based on the characteristics of multi-grade oil, there may be premature blackening during use and the oil pressure is lower than ordinary oil, which are all normal.

(3) Some domestic brand-name engine oils are of quite good quality, and the prices are much lower than imported similar products, so they can be used with confidence and there is no need to blindly pursue "foreign oil".

(4) If the engine is in good condition and the seasonal temperature is low, use oil with a lower viscosity as much as possible to keep the oil path unobstructed. For example, in high-temperature seasons or under severe engine wear conditions, the selection of high-viscosity oil will help to form an oil film and reduce engine wear.

5. All kinds of additives make sense

Adding other additives by oneself will not only not bring extra protection to the vehicle, but it will easily react with the chemicals in the oil, resulting in a decrease in the overall performance of the oil. Just like losing weight, you have to lose weight to lose weight, and you can only lose weight as you lose weight.

6. Pick up the oil and add it after opening the lid

Adding oil is really simple. First find a funnel, then hold the funnel with one hand and pour in the oil with the other.Adding too much or too little oil will result in poor engine operation. If too much oil is added, it will increase the amount of oil splashed into the inner wall of the cylinder when the crankshaft and connecting rod rotate, that is, the amount of oil entering the combustion chamber will be greatly increased, causing combustion Indoor carbon deposits increase, increasingpistonMovement resistance reduces the engine power.As the amount of engine oil entering the combustion chamber increases, exhaust emissions are worsened, affectingThree-way catalytic converterThe life span of the three-way catalytic converter may be damaged in severe cases.

When adding engine oil, the consistency of the added engine oil and the engine oil in the engine should be avoided, and the mixing of different brands and different types of engine oils should be avoided, so as to avoid the reaction of different types of additives in the engine oil.