Stealing oil from the filling machine is only the easiest and quickest way. There is a drain screw at the bottom of the fuel tank (almost all domestic cars have it). After that, the oil is drained faster than from above. There is also an oil return pipe. After it is removed, as long as the engine of the car is started, the oil will be pumped out continuously.
There are other ways, but not as convenient, fast and unobtrusive as these two.
In fact, to prevent drivers from stealing oil, the most important thing is to check frequently. You should know the fuel consumption of each section. It would be better if there were other lines with similar tonnage. With these data, even if there is stealing oil, the amount that can be stolen can be controlled to a minimum. Secondly, pay more attention to drivers. In fact, drivers of large transport vehicles are overloaded, black and white, tired, hard-working and dangerous, not the low quality we usually say. This is just a small number. As a car owner, as long as you are more concerned and considerate to those who create wealth for you, it is estimated that few people will take big risks to do things with less income.
Hehe, that's all. If you are wrong, you are welcome to pat the brick ~ ~ ~