In any lubricants, there are some additives that give a certain property for the intended application.\rThere are certain qualities when talking about additives in lubricants:\r• Has a detergent and dispersant effect (meaning that it keeps the surface of the engine clean and neutralizes acids. Also minimizes the agglomeration of deposits).\r• Good anti-oxidation: where the additive helps in slowing down the oxidation process and aging of the lubricant.\r• Good Anti-wear: They reduce the wear between the moving parts of the engine.\r• They are friction modifiers where they reduce the surface friction of lubricated parts thus saving energy and decrease fuel consumption.\rDue to all the points mentioned above, one can understand why the color of the oil might change.