This the type of oilcan most commonly used on farm machinery...
From which type of can came the term "oil-canning," which I haven't heard for years now, describing the behavior of thin door or quarter panels on low-price cars. The term referring, of course, to the springy action of the bottom of the oil can, which can be pushed in to squirt oil, and will spring back when released. I guess the term has fallen away because even low-priced cars have better sheet metal than once they did.
I know many/most of y'all know all that, but I have reached the age at which I get surprised regularly by what folks younger than me don't know.