If it is the same lubricant, according to the trend of time scale, it is possible to analyze and judge the change of the quality of lubricating oil. Because the change in color means that the chemical changes or pollutants.


But for the same kind of oil, the quality of the oil can not be judged only according to its color. The color of lubricating oil is related to its main raw material, and its color is not directly related to the quality of the oil.


Additive

Base oils vary in color depending on the depth of processing. I oil showed pale yellow, but after hydrogenation refining, II advanced treatment of III base oil, synthetic oil and take chemical preparation, such as PAO, polyether ester oil, etc., will contain less aromatic hydrocarbon impurities, their color will be relatively shallow, can reach as water. Bright!


Additive

Additives, air compressor oil, there are: viscosity index improver, extreme pressure and anti-wear agents, antioxidants, anti foaming agents, anti rust agents, anti emulsifier, etc.. All of these additives have different colors. When the additive and base oil are blended, the color of the lubricant will change differently, or deeper (e.g. Brown), or even shallower.


Dyeing agent

The effect of dyeing agents, sometimes in certain lubricants, grease, adding a particular dye to change their original color. The purpose of doing so is sometimes in order to serve as a warning to different lubricating oil, is in fact more marketing factors, such as we are light red, life is green, Atlas is a bright white, CompAir is blue, red and so on are united, sometimes just to different product line of distinction, not any stain lubricating protection.


In the use of air compressor oil, the oil will produce color change, from shallow to deep, this is a common phenomenon. It is unscientific that some users will directly darken the color of the oil products and confuse the quality of the oil products and change the oil immediately. When the air compressor oil needs to be replaced, in addition to judging from the appearance, but also the viscosity, acid insoluble matter content such as comprehensive index change test, or roughly according to the on-site service personnel from the experience, consistency, smell, appearance, preliminary determination, sometimes seemingly good appearance, but has severe rubber aging, such as judging only from appearance, easy to cause the waste of resources or ignore the real risk of the actual.