What is the difference between non-standard oil and national standard oil?

[JeremiahLynn]

The differences between non-standard oil and national standard oil are as follows: Density: The density range of national standard diesel is 0.810～0.855, varying with different models. Non-standard diesel certainly cannot meet such standards. Compared with regular diesel, apart from not meeting the standards, there is also the issue of price. Since it is non-standard, the price is significantly lower, and the combustion state is also different. Non-standard oil refers to blended oil that is not produced by regular refineries and fails to meet the national standards for clean gasoline and diesel. Its sources mainly include some individual gas stations that directly blend it with chemical raw materials such as naphtha, aromatics, and MTBE. Hazards: Non-standard diesel causes knocking in diesel vehicles, leading to severe mechanical wear, as well as difficulties in cold starts, increased fuel consumption, and black smoke emissions. It also generates deposits and gum, clogging car filters, forming a large amount of carbon deposits in the combustion chamber, causing piston sticking and increased wear.