Experts explain engine oil knowledge for you

【HCCar repairMaintenance Net]With the continuous improvement of people's living standards, the purchase of private cars has been included in the purchasing plans of more and more families.Although the vast majority of riders andCarHobbyists are all dear to the style and configuration of the car, but if you talk about itcar maintenanceMany people’s knowledge reserves are slightly lacking. In particular, a series of issues concerning the use of motor oil in automobiles have caused many car owners to scratch their heads. In response to this kind of phenomenon, the editor specially visited experts in the car maintenance industry and asked them to share with you some common knowledge about motor oil.

Types of car oil

There are many types of automobile oils, the commonly used models are SE, SF, SG, SJ, SL.SM, etc. The lower the number behind, the higher the grade. There are diesel CDs and the like, as well as diesel and gasoline CF.CF-4 and so on. The common specific viscosity grades are 0W-30.5W-30.10W-30, 0W-405W-40, 10W-40.15W-40.20W-50 and so on.

SAE (American Society of Automotive Engineers) uses a viscosity grade classification method. Car owners can compare their own car's ambient temperature to choose engine oil. For example, SAE15W-40, 10W-40, 5W-50, the smaller the number before W, the lower the low temperature viscosity, and the better the protection ability of the engine during cold start; the number after W is the index of high temperature resistance of engine oil.

API (American Petroleum Institute) adopts the engine oil quality grade assessment standard, which willlubricating oilDivided into two categories: gasoline engine (S) and diesel engine (C). The lubricating oil for gasoline engines is represented by S, followed by an English letter (such as SE, SF, SH, SJ, SL, SM). The lower the alphabetical order, the higher the quality of the lubricating oil. At present, the highest level of SM grade is undoubtedly the top engine oil.

How often does the car oil change

After a car is driven for a period of time, the power performance of the car engine will more or less decrease, fuel consumption will increase, and sometimes nozzle clogging will occur. The above "symptoms" are most likely due to the fact that the owner has not changed the oil for a long time,Oil filter,Air filterInsufficient fuel combustion and increased engine carbon deposits caused by other problems.

Experts suggest that car owners should change the engine oil and engine oil every 5000 kilometers.AirFilterAnd the oil filter needs to be replaced every 10,000 kilometers. Otherwise, the impurities in air, fuel and engine oil will cause the parts to wear and block the oil circuit, thereby affecting the normal operation of the engine. However, such a frequency of car oil replacement is only suitable for "normal driving" vehicles. And like driving where there are traffic lights everywhere, there are traffic jams at every turn, and most of the distance of each trip is less than 10 kilometers, the driving law is "dissipative driving".

In the case of "expensive driving", engine wear is also relatively large. As a result, the requirements for engine oil are relatively high. Car Collection recommends that car owners should shorten the interval between oil changes, so as to effectively protect the engine. So how often should the car oil be changed? In fact, it is difficult to judge whether the lubricating oil should be changed by eye or touch. However, after long-term use, the oil will accumulate a large amount of impurities. If not replaced in time, these impurities will also wear the engine and shorten the life of the car. Therefore, car owners must pay attention to the replacement time of the car's oil, and must not take it lightly!

Several misunderstandings in choosing engine oil

1. Some car owners mistakenly believe that a certain brand of oil is the special oil for a certain brand of car when choosing oil. In fact, this is wrong. As long as the grade and viscosity requirements meet the requirements of your car, you can buy and use it.

2. Use additives at will.