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I. What is non-standard diesel? Diesel produced from waste oils such as used engine oil and tire oil is called non-standard diesel. Non-standard diesel is usually purchased by oil depot owners or traders in the diesel industry, who then deliver it to factories in various regions according to customer demands. II. What are the hazards of non-standard diesel? 1. Non-standard diesel is generally produced by simply distilling imported No. 180 fuel oil to obtain diesel, after which some additives are added to improve certain quality parameters. In the initial stage, all quality parameters of such non-standard diesel meet the current **standards**, including the cetane number, which requires high levels, and which also satisfies the **standards**. One of the serious drawbacks of this type of oil is that its storage period is only about 20 days; after that it oxidizes rapidly and its color turns black ； Next is the excessive sulfur content. 2. Some refineries sell a type of white oil, which is cheaper in price compared to red oil. White diesel and red diesel are mixed in a certain ratio to produce non-standard diesel; this type of fuel has lower quality and a higher cost. Almost all gas stations in society prefer this light-grade fuel, which is abundant in the areas around Shenzhen. 3. Fuel oil (heavy diesel) is blended with naphtha (light oil), odorless kerosene, solvent oil, etc.; the resulting mixture is sold as light diesel, primarily to factories, ships, and other such entities. III. What is the impact of non-standard diesel on diesel vehicles? 1. It causes knocking in diesel vehicles, leading to severe mechanical wear, as well as difficulties in cold starting, higher fuel consumption, and black smoke from the exhaust. 2. It generates precipitates and gums, which clog the car filters; it also causes a large amount of carbon buildup in the combustion chamber, leading to piston sticking and increased wear. 3. Excess sulfur content not only causes corrosion and wear in the engine system but also leads to acid rain in the atmosphere. It significantly increases particulate matter (PM) emissions, reducing the efficiency of diesel engine emission control systems, causing poisoning, and even leading to their failure. What causes diesel to change color?