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On the old Buick valve-in-head (overhead valve) engines, the valve gear was out in the open. You actually had to manually oil all the rocker arms with an oil can... probably every day. Of course that was in the 1920s I think.
As for British cars, not to stereotype, but it does rain a lot there. They probably recommended greasing often to keep all the rainwater out of the joints. My guess, anyway.
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