In many beach areas there are special people whose job it is to go out and rescue anyone who might need help. Some beaches have life guards that can help, while others have to call in special rescue crews when something goes wrong. One of my friends is a person who goes out with these crews to try and find people that go missing in the waves.
When the water is especially cold and dangerous, the crew likes to use personal watercraft to make sure that they are able to get around quickly to cover a good amount of area. These crews can find people more quickly or at least search an area. Of course, this means that the boats have to be ready to go at just about any moment.
To make sure that they are able to keep the boats ready to go, they make sure that they are fueled up and have all of the oil that they need. I suspect they may use Yamalube 2W for oil since this is the type of oil that I would use in a boat like this. This would make it so they could keep the boats a lot better so they were always ready.