First of all, it's very clear that there are two standards for car maintenance: time and mileage. It's generally accepted that the first one to do the maintenance is no doubt. However, there are still some problems that need our attention. For example, what problems should we pay attention to when we are car riders? Let's first clarify a few problems.

一般来说，我们车友都普遍觉得按照车子行驶的里程数来做保养是没什么问题的，毕竟你车子跑了这么多公里了，不论是汽车的零部件啊，还是一些机油冷却液之类的，都有一定的磨损和消耗，所以理所当然到了规定里程数要保养，但是，如果我车子都没怎么开，那为什么我还要花钱去做这个保养呢?

Generally speaking, we riders generally think that it's no problem to do maintenance according to the mileage of the car. After all, your car has been running so many kilometers, whether it's the parts of the car, or some oil and coolant, they all have certain wear and consumption, so it's natural to have maintenance at the specified mileage. However, if I don't drive my car much, Then why do I have to pay for this maintenance?

多车上的用品以及车子的部件都是有保质期的。咱们就说机油吧，我们使用机油一旦开封，加入到发动机中，这期间必定是要跟空气等接触的，即便你车子不运转，机油也只能在它的保质期中才能发挥更好的润滑作用，一旦过了保质期，可能这个机油的很多性能就大不如前了，那带来的必然是发动机的一些磨损等问题。

Many of the car's supplies and car parts have a shelf life. Let's talk about engine oil. Once the engine oil is opened and added to the engine, it must be in contact with the air during this period. Even if your car doesn't run, the engine oil can only play a better lubricating role in its shelf life. Once the shelf life is over, many properties of the engine oil may not be as good as before, which inevitably leads to some wear of the engine And so on.

这个道理很简单，就像你买了一瓶饮料，打开喝了一口，那你再放着肯定保质期就要缩短了，可能第二天还能喝，但你心里也不舒服，觉得过保质期了，因为人家提醒了，开盖即饮。

The reason is very simple. If you buy a bottle of drink and open it for a sip, you will surely shorten the shelf life if you put it again. You may be able to drink it the next day, but you are also uncomfortable. You feel that the shelf life has passed, because people remind you to drink immediately after opening the lid.

而这些汽车相关的东西的保养周期都是厂家经过各种不同的形式路况和用车条件去做试验，然后根据这些试验结果调整做出的适合的保养时间间隔。

The maintenance cycle of these car related things is that the manufacturer carries out tests under various road conditions and vehicle conditions, and then adjusts the appropriate maintenance interval according to the test results.