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...why? rhetorical emphasis only.
...being basically "incompressible," nasty things *happen* when rotating parts "hit" liquid oil in the crankcase.
...sorta akin to a "metallic bellyflop" for each cylinder as the engine turns.
...as mentioned earlier, that's why crankcase "windage" trays are often (but not always) used in high-rpm engines -- to keep metal and liquid oil totally separated, and metal and oil vapor/foam as far apart as possible.
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