1 year drives 2000 kilometers. Can it be maintained once a year?
There are two biggest pain points for ordinary workers to buy back their cars. One is how to save fuel, and the other is how to maintain them. The internet is full of all kinds of voices, such as once a year, once every six months, and some people even say that driving less can be maintained once every two years. However, the 4S shop recommends maintenance every 3 months or 5000 kilometers. These two statements are quite different. Which is more reliable?
Why do you need to maintain the engine?
The oil in the engine naturally deteriorates and needs to be replaced regularly to ensure the best lubrication effect of all parts of the engine and ensure the normal operation of the engine. Engine oil is an oily substance, which is bound to deteriorate. It has a service life, and its service life will decline day by day after experiencing the high temperature of the engine and the friction of various parts every day in the engine. Generally, we ordinary workers define the service life of engine oil according to the mileage of vehicles. For example, 5,000 kilometers to replace mineral oil, 7,500 kilometers to replace semi-synthetic oil, 10000 kilometers to replace the whole of synthetic engine oil.
However, as a manufacturer of engine oil and a 4S shop, in addition to mileage, there is also a time limit, that is, it cannot exceed several months, usually six months, and some people call it three months. In fact, the advice given by 4S stores is very conservative, and its significance is just like the fuel consumption standard measured by the Ministry of Industry and Information Technology, and it can only be used as a reference. But it's too outrageous to say on the Internet that it only takes two years or more to maintain it.
The engine oil is just like the snacks we buy in the supermarket. Once the shelf life is over, it can't be sold and needs to be taken off the shelf.
But it doesn't mean that it will go bad immediately after the shelf life. That's not true. You can check the definition of shelf life online. There is one item in the Food Safety Law that has not been amended, that is to say, foods that have exceeded the shelf life for a certain period of time can still be eaten. For example, the cake you bought today will expire in the afternoon 12, but you can put it in the refrigerator and eat it tomorrow morning. It won't go bad so soon.
The shelf life of general engine oil is 4 to 5 years. For example, Mobil engine oil has a shelf life of 5 years.
However, there is a prerequisite for this shelf life, that is, it must be sealed and stored in a dry and cool place. After the oil is added to the engine, it is not a sealed environment. There are exhaust pipes, throttles, etc. In an engine, they are not sealed structures, but they are better sealed than being directly exposed to the air. In addition, the engine will produce high-temperature friction and shear oil when working, so we need to replace it when the car reaches kilometers at ordinary times. But what if you drive less and drive 2000 kilometers a year?
When the vehicle is driven less, there will be less friction between various parts of the engine and the engine oil, although the shelf life of the engine oil is not sealed. However, it can still be stored in the engine for a period of time, which is definitely not up to the standard of 5 years, but it is still no problem to put it in one year. At this time, the oil will be emulsified and deteriorated, but its performance will not change much, and it can still be used. It is no problem to maintain it once a year. Some factories have their own machines and need engine oil. They all buy those 180L railcom engine oil for recycling. They didn't use it all at once, but a year and a half later. As usual, no problem. Therefore, if you drive frequently, you will be maintained when you reach the mileage. However, if you don't give advice often and don't waste money, you can replace it in a few months and you can use it for one year.