Motor oil to identify the real and fake mainly have the following methods, respectively: 1, through the nose to smell the way to identify. True motor oil will have a faint fragrance, generally speaking, the composition of motor oil by the base oil and additives composed of two parts, and in addition to the mineral oil on the market, several other types of motor oil are basically chemical additives that is, 0.6% of the aromatic hydrocarbons, this is due to the different oils of different odors vary in shades, if the smell of the oil is more pungent, then it can be judged as a fake motor oil. 2, by the degree of adhesion to the engine oil To analyze. Good motor oil to a certain extent above the more dilute, with the hand to rub when there is no particulate matter, and the second a little bit of motor oil there will be some particles, after all, fake motor oil is basically a waste oil refining, so there is a difference with a molding. 3, through the engine sound to judge. Fake motor oil is subjected to high temperatures, there will be a bonding situation, the higher the engine temperature, the more viscous the oil will be, which will lead to serious oil ablation into the mud of the situation occurs, the real engine oil engine sound is more uniform, there is no murmur, while the fake motor oil is different, fake motor oil sound is more noisy.