As the saying goes, "it is easy to buy a car and it is difficult to maintain a car", after the owners buy a vehicle, they must always pay attention to the maintenance of the vehicle, the most important of which is the replacement of engine oil. Under normal circumstances, after the new car is bought, the old drivers recommend that you choose the same type of oil for maintenance, this statement is not absolute, after the vehicle mileage exceeds 100,000 kilometers, the wear of various parts inside the engine is intensified, in this case, the owner needs to replace the engine oil. Let's introduce the problems related to engine oil selection!
The model of the engine oil
On the outer packaging of the oil, we can see the two signs of API and SAE, of which API is the abbreviation of the American Petroleum Association, which refers to the quality level of the oil, and SAE is the abbreviation of the American Automotive Engineering Association, which refers to the viscosity value of the oil.
Among them, 10W-40 refers to the SAE viscosity value of the oil, 10 represents the anti-low temperature performance of the oil, its corresponding freezing point temperature is -25 ° C, W refers to the winter oil, 40 refers to the kinematic viscosity of the oil at 100 ° C, the higher the value, the greater the viscosity of the oil, the worse its fluidity under high temperature conditions. For new cars, when choosing oil, we generally recommend 20 or 30 oil, for its low temperature resistance, it is generally recommended to choose 0W or 5W oil, 0W is suitable for use in the three northeastern provinces, and 5W is suitable for any other region.
API's engine oil is divided into two categories, one is gasoline engine oil, starting with S, SA, SB, SC... SL, SM, SN, another type is diesel engines, CA, CB, CC..., the letter is later, the higher the quality level of the oil, of which, the most used by car owners is SL, SM, SN oil, these oils are generally fully synthetic oil, its oxidation resistance, stability under high temperature conditions are very strong, shelf life is also long.
After driving 100,000 kilometers, do I need to change the engine oil?
For vehicles with a long driving range, the engine working time is also longer, the wear of the parts inside the engine will also be aggravated, the gap between the parts will naturally become larger, if you choose a good fluidity oil, the oil is easy to leak in the gap of the parts, it is difficult to form a stable lubricating oil film on the surface of the engine parts, the engine will be aggravated when it is started at low temperature, and even the abnormal sound of mechanical grinding will occur.
Therefore, after the vehicle's mileage exceeds 100,000 kilometers, we generally choose a motor oil with a large viscosity coefficient and a fluidity deviation, which is easy to remain in the gap between the engine parts, which is conducive to forming a stable lubricating oil film on the surface of the parts, thereby slowing down the wear of the engine. Under normal circumstances, after the vehicle has traveled 100,000 kilometers, the old drivers are very conscious to replace the engine oil with 5W40 or 0W40 oil.
For the replacement cycle of engine oil, if you choose semi-synthetic oil, it is generally 5000 ~ 7000 km / 7 ~ 9 months of maintenance, if you choose full synthetic oil, generally 10,000 ~ 15,000 / 12 months of maintenance, the specific maintenance cycle can be determined according to the type of oil and the driving conditions of the owner.
For engine oil maintenance, it is a difficult to say, simple and simple knowledge, if you do not understand, you can always consult the "car overview", must know everything, endless!