How to identify genuine and fake machine oils?

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　　(1) Identifying fake gasoline: One way is to check the color of the fuel; genuine gasoline is light yellow, pale red, or orange-yellow in color. Second, observe the bubbles: they appear when shaken and disappear as soon as they form. Third is smelling the odor; genuine gasoline has a strong gasoline scent when sniffed with the nose. Fourth, check the oil quality: it feels rough to the touch and has a cool sensation. Fifth, observe the volatility of the oil; genuine gasoline has a high degree of volatility. If it lacks these five characteristics, it can be considered low-quality gasoline. 　　(2) Identifying fake kerosene: Genuine kerosene is white or light yellow in color and transparent. After shaking, the bubbles disappear quickly, and there is a strong kerosene smell. Upon touch, it has a slight smoothness, and its volatility is low. If the above characteristics are not apparent or absent, it indicates that it is fake and low-quality kerosene. 　　(3) Distinguishing fake light and heavy diesel: Genuine light diesel is tea-colored, has a blue tint on its surface, and has a diesel odor. The bubbles produced after shaking are small and disappear quickly. It feels smooth to the touch, and oily when hands come into contact with it. Authentic heavy diesel is brownish in color, has a slight diesel odor, and is somewhat smelly. After shaking, the bubbles turn yellow and disappear quickly. The back of the hand feels smooth and oily to the touch. Diesel that does not match the above characteristics is counterfeit diesel. 　　(4) Identification of fake No. 0 and No. -20 diesel: Genuine diesel is yellow in color with a flash point of over 60°C, while low-quality diesel contains a high amount of carbon residues, is black in color, and has a flash point of only 43°C. At present, the agricultural diesel we supply includes two types: diesel grade O and diesel grade 120. The methods for distinguishing between the two types of diesel are as follows: ① Cooling test: Place a glass tube containing a small amount of diesel into ice water; if it solidifies immediately, it is not grade O diesel, whereas if it does not solidify, then it is grade O diesel. If there is no ice water, cold water can be used as a substitute. ②Combustion identification method: Compare the combustion of two types of diesel; diesel grade -20 produces more black smoke, while diesel grade 0 produces less black smoke. ③Oil quality observation method: No. 0 diesel contains little wax, has a low density, and is yellow in color. —No. 20 diesel contains a high amount of wax, has a high density, and is darker in color. ④Density test method: No. 0 diesel has a lower density than No. -20 diesel. When the two types of diesel are mixed in a transparent container, it can be observed that diesel No. -20 sinks while diesel No. 0 floats. If the identification result differs from the above, it indicates that it is counterfeit diesel of grade O or -20. 　　(5) Identifying fake engine oil: What is covered here mainly refers to engine oil for gasoline and diesel engines. These types of engine oil have distinct characteristics. First, the oil color and odor are very distinctive. These oils are dark brown to blue-yellow in color and have an acidic odor. Second, the bubbles are special. After shaking, there are few large bubbles that dissipate slowly; the oil turns yellow after settling in the bottle. Third, the feel is special. After being dipped in the dipping sauce and twisted, it becomes slightly emulsified and viscous, allowing short threads to be pulled out. Those that do not match the above characteristics are counterfeit products. 　　(6) Identifying fake LuLuDa engine oil: LuLuDa engine oil is currently a type of engine oil highly favored by many users. It is simple to identify counterfeit Luluda engine oils. Genuine LuLuDa engine oil is packaged in an alloy steel container; the container is decorated with a large \"rotelladx\" pattern, and it clearly displays the words \"LuLuDa 40\" ； The trademark features a scallop-shaped design, with the word “shell” below it. It is genuine LuLuDa engine oil, with a three-dimensional anti-counterfeiting label specifically installed on the container. The label is a rounded rectangle, bearing a trademark composed of the words “shell” and scallop patterns, with the word “lubrication” on the left side. Anti-counterfeiting labels are generally attached to the top of the container for easy identification. It’s a fake product; it doesn’t have such special labels. Therefore, by identifying the anti-counterfeiting label, one can obtain genuine Luluda engine oil. 　　(7) Identifying fake gear oil: First, check the color; genuine gear oil is black to dark green in color. Secondly, smell the oil; genuine gear oil has a burnt smell. Looking again at the fluidity of the oil, genuine gear oil does not clear up after it ‘hangs in the bottle’ for a long time. One also needs to look at the bubbles in the oil; in genuine oil, bubbles are rarely seen after shaking it. Finally, consider the viscosity of the oil: genuine gear oil leaves a residue on the fingers that is difficult to remove and can form threads when pulled. If it does not possess the above characteristics, it is fake gear oil. 　　(8) Identifying fake calcium-based greases: One way is to check the color and texture of the grease. Genuine calcium-based greases are yellow-brown in color, have a uniform structure, are smooth, and appear in the form of an ointment. The second is a water test to observe the behavior in water; the lip balm of genuine quality shows no significant changes in water and does not emulsify when stirred. Third, test its viscosity and feel; a genuine product feels smooth to the touch, does not pull into threads, and does not emulsify when twisted in water. Products with the above characteristics are genuine; otherwise, they are fake.