Why do you need to shorten the oil change interval when you often use low quality cheap gasoline?

There is an interesting phenomenon, I don't know if you have noticed: some imported models, in foreign countries can change the oil once every 20,000 or even 30,000 kilometers, and after importing to China, it is required to change the oil once every 10,000 kilometers. Why is that?

In fact, the main reason for this situation is the poor quality of fuel in China. Many people think that this reason is very far-fetched, in everyone's cognition, oil and fuel belong to two completely different systems, there is no channel between them, they should not interfere with each other, the quality of fuel will not affect the performance of engine oil. But in fact, fuel quality can have a considerable impact on the performance and life of an oil.

In some models, it is clearly stated in the instruction manual that the use of low-quality fuel requires a change of oil in advance. Especially for diesel engines, the quality of diesel has a greater impact on the oil, if you accidentally add inferior diesel, the engine will soon be corroded and worn, seriously shortening the service life of the engine.

So how does fuel affect the performance and life of engine oil? Let's break it down in detail.

Do you remember last year's Honda CRV oil increase incident? Although the final processing result is not perfect, it has taught car owners across the country a realistic and vivid lesson in engine principles. Honda explains the reason for the increase in engine oil as follows:

During the cold start phase of the engine, a portion of the gasoline is injected directly into the cylinder walls, creating a "wet wall" effect, which does not participate in the combustion, but enters the crankcase through the gap between the piston ring and the cylinder wall, and then mixes with the oil in the oil pan, resulting in an increase in oil.

In addition, during the combustion process, there will also be a part of the gasoline vapor that is not completely burned, through the gap between the piston ring and the cylinder wall into the crankcase, in the case of low engine temperature, these gasoline vapors in the crankcase quickly condense and mix with the oil, which will also lead to an increase in oil. This kind of oil diluted by gasoline has reduced lubricating performance and weakened protection ability for the engine, so it needs to be replaced in time, and if it is used for a long time, it will lead to serious wear and tear of the engine.

Cheap gasoline has a low purity, which causes greater loss and degrades its performance quickly.

Using low-quality fuel requires an oil change in advance. Especially for diesel engines, the quality of diesel has a greater impact on the engine oil.

During the cold start phase of the engine, a portion of the gasoline is injected directly into the cylinder walls, creating a "wet wall" effect, which does not participate in the combustion, but enters the crankcase through the gap between the piston ring and the cylinder wall.

In foreign countries, the oil can be changed once every 20,000 or even 30,000 kilometers, and after being imported into China, it is required to change the engine oil once every 10,000 kilometers.

In fact, the main reason for this situation is the poor quality of fuel in China.

I don't know if you have noticed, but the quality of diesel oil has a greater impact on engine oil.

The lower the quality of the gasoline, the more fuel-efficient it is because of the gasoline label and compression ratio. Gasoline labeling, refers to the ratio of isooctane and n-heptane content in gasoline, compression ratio refers to the volume of automobile cylinder compression before compression and the volume of oil and gas mixture after compression, the larger the air compression ratio, the greater the compression of the mixed gas, and the combustion of the mixed gas is more sufficient, so the anti-knocking resistance of the mixed gas is indirectly the gasoline label has extremely strict requirements.

Inferior gasoline is damaging to carsInferior gasoline due to more impurities, is very prone to insufficient combustion, and the fuel contains impurities, will make the car oil supply abnormal, engine shaking and even block the oil circuit, due to insufficient gasoline combustion, it is inevitable to produce more carbon deposits, attached to the engine, long-term use will increase the fuel consumption of the car and even damage the engine.

The exhaust gas produced after the combustion of inferior gasoline will exceed the standard, the three-way catalytic converter is used to purify the exhaust gas, and the exhaust gas exceeds the standard, so the three-way catalytic converter will also have irreversible damage to the lead bucket, and it will need to be replaced if it reaches a certain extent, and the original three-way catalytic converter is generally thousands of yuan, or even tens of thousands of yuan.

Customers often think that because they are paying more for a higher quality level of lubricant, they should use it longer. For example, a customer buys a high-grade lubricant at twice the number of certain grades**, and they want to use it twice as long. This is wrong.

Because: 1) In order to achieve the maximum engine life, customers should change their engine oil according to the interval recommended by the equipment manufacturer, the engine is much more expensive than the oil, so the engine life is far more important than the oil change interval.

2) Low-quality engine oils contain very few additives to combat soot and high temperatures. Oil should be changed as recommended by the manufacturer, with high quality grades containing many times more additives than lower grade oils and providing a "quality assurance" for maximum engine life.

Hello: Regarding the question you asked, for the remaining engine oil after maintenance, it can be used within half a year after opening, and it is best not to continue to use it after more than half a year; Regarding the question of oil products, as long as it is a regular PetroChina or Sinopec gas station, there is no problem, 93 and 97 gasoline can be mixed, but it is not recommended to do this often, you only need to add 93 gasoline, there is no problem with gas stations on the general highway, I hope my answer will be helpful to you.