How much oil is too much oil?
 

This is pretty cool

https://www.youtube.com/watch?v=VaTbfvzNbxQ

interesting. Thanks

Great. I would take this video with a grain of salt. The end of the video went as I expected, with oil splattering outside of the block. I have seen results of overfilling and of course under optimal levels of oil. I do not condone under or over filling of oil in any case. It should be at optimal level. GM and other manufacturers have laboratories, and should have done many studies of oil and its effect on the engine many, many years ago.

Without watching the thing, did they monitor oil pressure to check for aeration of the oil? It will certainly be loosing horsepower due to windage.