Recommend car maintenance, especially these two types of projects.

Going to the 4S shop for maintenance, although the price is slightly higher, but because of its good safety, it gives people a feeling of being practical and secure, which is understandable. However, some maintenance items recommended by 4S stores are suspected of over-maintenance. Excessive maintenance itself is not good or bad for the car, but it will make the owner spend more money. There are a lot of maintenance that actually have little effect, or just play a icing on the cake, such as engine painting. Engine coating (engine room coating) is a protective agent sprayed on the engine surface to protect the oil pipes, pipelines and rubber products in the engine room, and at the same time prevent dust and rust. The purpose of painting itself is good, which improves the service life and stability of the engine, but on the other hand, even if the engine is not painted, it seems that it will not be affected by any essence (the engine without painting can be stable and reliable). It can only be said that the function of the coating is more beautiful, which plays a icing on the cake.

Another example is the maintenance project of air conditioning (indoor) sterilization, which is really different. The starting point of air conditioning sterilization and odor removal is good, but whether it is necessary or not, I am afraid it should be a prudent choice, because it is more of a "not bad money" consumption. Maybe you can do it yourself and spray the cleaning agent along the air duct of the air conditioner (generally, indoor sterilization is to spray the disinfectant into the car as a mist, or inject ozone, and then turn on the air conditioner to circulate the smoke to complete the sterilization and disinfection of the whole car). In addition to the so-called sterilization, in fact, it is better to change the air conditioning filter frequently than anything else, because the air conditioning filter is very cheap and practical. There are many such examples, such as carbon deposit in bottle washing, oil and gasoline additives, tire waxing and so on. If a car wants to maintain long-term reliability, it cannot be separated from the word "careful care", but some "care", we need to admit, is very excessive and unnecessary.

The most popular maintenance recommendation: cleaning the throttle.

In addition to routine maintenance, there is also a maintenance that is often recommended by 4S stores. It is estimated that many car owners have experienced it, that is, a maintenance related to the throttle.

Throttle, commonly known as the throat of the engine, is very important to the performance of the car. If there is too much carbon in the throttle, the engine will have insufficient air intake, resulting in unstable idle speed, jitter, fuel consumption, acceleration and other symptoms. However, I have to admit that many vehicles are recommended by 4S stores for throttle cleaning and maintenance before they travel more than 20,000 kilometers. Is this suspected of over-maintenance? Although there is no accurate threshold for the cleaning cycle of throttle carbon deposit, for most cars running 20-30 thousand kilometers, the engine throttle is relatively clean, and a slightly dirty throttle has little effect on air intake.

Cleaning the throttle valve is a "meager profit" business, but excessive cleaning is really unnecessary. Generally, cars have idling instability, jitter, fuel consumption, frustration and other phenomena. You can consider cleaning the throttle valve and also cleaning the idle valve together. If you want preventive cleaning, you can consider cleaning the throttle every 40 thousand kilometers. If the driving standard and idle time are reduced, we can also consider extending the maintenance cycle of the throttle appropriately. When cleaning the throttle, it is best not to use the "hanging bottle" cleaning method, but to remove it, spray a cleaning agent, and thoroughly clean the front with a small brush. After cleaning, pay attention to the matching with the driving computer.

Rejecting excessive maintenance-the temptation of a series of maintenance package discounts

Always go to maintenance, maybe you can meet a bundled maintenance package, and attract customers with big discounts and discounts on working hours. Moreover, almost every once in a while, some stores will launch promotional maintenance packages. The most common ones are cleaning the air intake, cleaning the oil circuit, cleaning the oil nozzle, cleaning or replacing the spark plug, changing the gearbox oil, changing the brake oil and so on.

In fact, while we are happy to get the preferential maintenance package, have we considered whether these maintenance are necessary? If it is not necessary, it is not worthwhile to spend even a small amount of money, especially if only a small maintenance is needed, but the result is a big maintenance. Therefore, before going to 4S for maintenance, you must first know what your car needs, and it is best not to be disturbed by the so-called discount.