As for that paper...I can't read it...but I do note it references 1917 in a few places, and it includes a section on 'the effect of over-oiling'. The paper I'm sure has some validity but what was 'gospel' in 1917 most likely is no longer 100% accurate a hundred years later. I attend engineering papers every year and one thing is always true - a group of engineers will present their findings, then another group of engineers will stand up and contest their findings. A paper can present meaningful data but seldom all of the data and even more seldom is it accepted as 'fact'.
