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A group of people who illegally bought marine diesel, which is duty-free oil, mixed it with general diesel and sold it, were caught by the police. 



Marine diesel is cheap, but it has different ingredients, so it's not good for car engines or the environment. 



<Reporter> In 



the middle of the night, the tank lorry that left the gas station stops at a sparsely populated port. 



This is a scene of illegally trading cheap marine diesel at 400 won per liter of duty-free oil. 



The party distributed marine diesel purchased from a supplier mixed with general diesel. 



The problem was the color. 



As you can see, marine diesel has a red color like this, whereas general diesel is yellow. 



They have a distinctly different color in appearance. 



As you can see, it is still reddish when mixed, so the manufacturers wanted to get rid of the reddishness of the marine diesel before making fake diesel. 



Chemicals that can change the color of light oil are added, and 



[(What did you pour?) There's a can.

I'm pouring it on three (caps).] 



To remove the red color, we even mobilized 'decolorization equipment' containing activated carbon. 



A total of 5 million liters of fake diesel made by mixing marine diesel and general diesel that went through this process in a ratio of 1 to 2 were sent to 21 gas stations nationwide that conspired to commit a crime in advance. 



From February 2020 to October last year, it earned about 1.5 billion won. 



Marine diesel contains a lot of sulfur, which increases environmental pollution and is vulnerable to safety. 



[Pilsu Kim/Professor, Department of Automobile, Daelim University: Not only that, safety accidents can occur because the engine is turned off while driving.

In addition, as the emission gas itself increases, the environmental impact is also…

.] 



Secret crimes were caught during the joint crackdown between the police and the Korea National Oil Management Agency. 



The police arrested four of the 50 people arrested, including the general manager, Lee Mo, and handed the case over to the prosecution. 



(Video coverage: Hyung Yoon, video editing: Kim Byung-jik, CG: Park Cheon-woong, screen provided: Seoul National Police Agency, Korea Petroleum Service)