I always threw the oil cap: a colleague explained to me what he was really doing.

This plug has always made me furious, because sometimes you have to pull it forcefully and quite suddenly, resulting in spills of oil. And sometimes the ring breaks and it is then very difficult to open the oil. But not so long ago, I found out why it was really necessary.
Now, I'm going to tell you everything in detail. The fact is that the card has to be put back in its place, but before that you have to turn it over.

After that, press the cap inside the bottle so that it is attached between the slots.

The sequel on the next page