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How to choose the right engine oil
Source: | Author:haiyangshiyou | Published time: 2017-12-06 | 974 Views | Share:

Automotive evaluation: As a daily travel of vehicles as a means of transport in the use of the process, in order to better protect the engine performance and service life, regular maintenance of the engine is an essential means.
For the expensive 4S shop, most users will choose the oil brand franchise shop or shop to buy oil for maintenance. But the problem is the face of the market all kinds of oil products and models, how to choose a suitable for their own vehicle it. To this end, the evaluation of Jun carefully compiled an article on how to choose the oil for your reference. What are the meaning of the English abbreviations on the trademark? API - American Petroleum Institute acronym. API level represents the classification of engine oil quality. "S" series represents gasoline engine oil; "C" series represents diesel engine oil; when "S" and "C" two letters exist at the same time, it means that the oil is the general type of gasoline and diesel. From "SA" to "SN" level, every time a letter is incremented, the performance of the oil will be better than the previous one. The oil will contain more additives to protect the engine. The more letters behind, on behalf of the higher grade oil quality. ACEA - European Automobile Manufacturers Association. Similar to API, the difference is that API is American standard, while ACEA is European standard. ACEA's evaluation criteria are also used to indicate the level of letters classification, is now more common in the bottom of the drum mark two logo at the same time there. SAE - American Society of Automotive Engineers abbreviation. SAE is the viscosity grade of oil. Among them, the smaller the number in front of "W" (winter), indicating that the lower the viscosity at low temperature, the better the fluidity, the lower the ambient temperature available, and the better the protection of the engine at start-up; the "W" The back of the figure is the oil temperature index, the greater the value that the oil at high temperatures, the better the protection performance. Such as: SAE40, SAE50 only one set of values for the "single-stage oil", apply to warm climates, can not be used in cold regions. The 5W-40, 10W-40 and other two values represent the "multi-stage oil" for a wide range of low to high temperature, the viscosity value will be given full protection of the engine temperature changes. The specific choice according to the vehicle environment, temperature and other factors to choose the right oil, or see the owner's manual instructions.
Why the same brand of oil so much price gap
At present, the engine oil on the market is divided into two categories: mineral oil and synthetic oil. The difference between the two is that the base oil is different. The base oil of mineral oil is refined from crude oil, while the base oil of synthetic oil is chemically synthesized. Compared with mineral oil, high temperature oxidation of synthetic oil, anti-viscosity changes, more wear resistance. In addition, the synthetic oil is divided into semi-synthetic and fully synthetic motor oil, the biggest difference between the two is the use of synthetic oil, the wider temperature, longer life. Oil film at the request of the same, the synthetic oil can be used with lower viscosity can be reached, while the semi-synthetic oil on the need to use thick viscous oil relative to the synthetic oil can meet this requirement. In other words, in the same working environment, the whole synthetic oil with a lower viscosity can achieve the purpose of protecting the engine.
Both mineral and synthetic oils are made up of base oils and additives that gradually oxidize along with the seasons and the working environment of the engine. The additives also slowly dissipate or deteriorate over time, eventually leading to lubrication The overall performance of the oil decreased, the protection of the engine getting lower and lower, or even fail to protect. Therefore, according to mileage or time, worth mentioning, regular replacement of oil, is to protect the efficient operation of the engine and an important means of life.