With the popularity of automobiles, more and more owners have begun to purchase their own oil. How to choose oil? Experts pointed out that we must first have a more comprehensive understanding of the oil viscosity and quality levels in order to choose a more suitable oil.
When choosing oil, we are mainly concerned with two parameters - "SAE viscosity grade" and "API quality grade". These two parameters are clearly marked on the oil tank. In addition to these two parameters, consumers can choose good reputation brands according to their preferences.
Determine SAE viscosity grade
Common motor oils on the market have been graded using SAE (American Society of Automotive Engineers) standards. We will see the corresponding oil viscosity value on the oil tank body, such as "0W30". The "0" before "W" indicates that the oil has a low viscosity level of 0, and "30" after "W". The high temperature viscosity grade of the oil is 30.
Interpretation of this figure may be more complicated. For owners of vehicles in Foshan or the same environment, the choice of engine oil generally does not require high SAE. Commonly used 10W30 and 15W40 can meet the requirements for use. In general, in cold regions, it is required to select the oil whose value is 0W or 5W.
In addition to common viscosity grades such as 10W30, there are also some oil grades that are individual, ie there are no follow-up figures. From the perspective of actual car use, it is recommended that vehicle owners choose oils with similar levels as mentioned above. These oils can meet a wide range of areas from low temperatures to high temperatures. Adapting to changes in temperature gives the engine more comprehensive protection.
In addition, if the owner does not know the viscosity of the selected oil, the owner's manual can be consulted. The general owner's manual will have specific rules, including the choice of the viscosity of oil in cold areas.
Selected API oil quality grade
According to international practice, the grade of oil is indicated by the API standard mark. We see “SJâ€, “SLâ€, “SM†or “SN†in the body of the oil tank, which is the grade of oil. The more the letters following the "S" are sorted, the better the durability and quality of the oil.
General synthetic oils that we often refer to are generally graded “SM†or “SNâ€; semi-synthetic oil grades are generally “SL†or “SMâ€; mineral oil grades are generally “SJâ€. The performance index of the fully synthetic motor oil of the same viscosity grade and common mineral oil is not much different. The difference between the two is mainly reflected in the stability, durability and the cleanliness of the engine. In a conventional car environment, fully synthetic motor oils are more stable, and the replacement cycle can be as long as 10,000 kilometers. Mineral oil is recommended for replacement of 5,000 kilometers.
The reporter found that the current price of synthetic oil is generally more than 400 yuan, semi-synthetic engine oil is priced at 250 yuan, while mineral oil is about 150 yuan.
From the point of view of car use, most private cars do not travel long kilometers. If the oil is replaced with reference to 5,000 kilometers, the universal car cycle is four months or longer. Because the oil during use will be used for too long, resulting in reduced performance, such as non-vehicle engine special requirements, the owner generally choose semi-synthetic engine oil. Of course, if it is not bad, under the condition of satisfying the viscosity, the higher the level of the oil, the better.
It is worth mentioning that the operating status of the engine also affects the choice of oil level. In general, for vehicles with high compression ratios and those who like to drive the engine at a high speed, it is recommended to select a fully synthetic engine oil.
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