John Deere 318 Crankcase Breather Learn With Me HD 1080p

This was supposed to be a quick, light duty tinkering while I'm home, recovering from surgery. It turned into a much bigger ordeal than I expected. Fortunately (I guess) nothing was wrong. That doesn't explain what keeps pushing oil up the dipstick tube, but (hopefully) at least means my crankcase isn't building pressure.
I suspect this is the same with other Onan powered models (316, 420, etc.).