Is it illegal to add diesel to a modified car at a gas station?

According to Article 16 of the Road Traffic Safety Law of the People's Republic of China, no unit or individual is allowed to change the registered structure, structure and characteristics of motor vehicles without authorization, and it is illegal to modify the truck itself, so it is illegal to knowingly add diesel oil.

A gas station refers to a supplementary station that serves automobiles and other motor vehicles and retails gasoline and engine oil. It is generally used to add fuel and lubricating oil.