Why are the oils of the same label clearly different in color?
First, the oil storage system, such as oil tanks or pipes, is polluted and the color will become darker.
Second, after the gasoline is oxidized, the color will also become darker.
Third, sometimes some artificial additives are used, and some additives are afraid of light, and are easily decomposed in the presence of light, resulting in darker colors.
The state has strict testing of gasoline through professional and technical means. There are 26 testing items and 18 testing standards, but there is no standard for the color of gasoline.
Then the problem is coming. The color of the gasoline is different. Can you explain the quality of the oil?
Judging whether gasoline is good or bad is mainly two evaluation indicators: one is the distillation range and the other is the octane number. Among them, the distillation range reflects the evaporability of gasoline, and the octane number reflects the explosion resistance. As for the color difference of gasoline, the reason is actually more objective than imagined.
- Crude oil origin
In different oil-producing areas, the oils produced have different compositions and their specific gravity, and the colors are naturally different. At present, China has surpassed the United States to become the world’s largest crude oil importer, with a foreign dependence of up to 75% on crude oil used in China. In addition to domestically produced crude oil, most of them come from oil-producing countries in the Middle East, South America and other places, and the color of crude oil exported to China from these countries is not the same.
The refining process and equipment renewal of different refineries are different, which is also the reason for the difference in the color of the refined oil. In the process of refining and crude oil, as long as the refining process is slightly different, there is a difference in the separation of crude oil components, and the color of the refined oil is different.
- Geographical differences
In the south and north, due to the wide range of climatic conditions such as temperature and precipitation, there are differences in the use of additives. For example, antifreeze is required in low temperature areas in the north. In addition, different storage conditions may also result in differences in gasoline color.
In general, regardless of gasoline or diesel, oil testing and oil standards are both established and uniform. The difference in color does not indicate the quality of the product.