M110 2.8l

What is the purpose of the hose running from the head, to the sump?
I know it carries oil, but why doesn't the oil just run back down internally
like other engines?
Also it looks like the oil pump is external and is easy to change in case of failure.. is this true ?
fascinating design, I also like how you have an oil cooler, what a great idea, adding a turbo with a custom manifold looks like a piece of cake, would they handle it though?
I'll have to get one if I like your answers.
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