From where should an International not leak oil...?

A brief word to those already initiated and wise...  If you want to get to the sole purpose of this thread, please skip to the bottom of this missive to the last two short paragraphs followed by my questions so as to save yourself time and relieve yourself of the burden of my attempts at humor...

Otherwise...  Forewarned is forearmed.  I cannot resist sharing my curiosity aloud any longer.  And I want to try to have fun with this topic by exhibiting some sense of humor around this subject that's so well shocking me... 

I've recognized and accepted and am immersing myself in the rich history by which many International machines have become a mix of parts resulting from their storied and illustrious racing careers, the joys and sorrows the International has given the countless many before us and the ravages of time that can exact its cruel toll on our beloved 80+ year old motorcycles.  In fact, I am looking forward to learning with a somewhat morbid curiosity what Chris Streather's certification will reveal and what more questions I will have from engine and frame numbers I've submitted that may offer some information offering some more clues about my International. (My "morbid curiosity" rises from having practiced as a registered nurse for 48 years).

When I purchased my International, the seller warned me that "It is a fact of life that International's leak oil."  I have to admit that I am in a state of gobstruck awe of the amount of oil my '37 leaks seemingly from any and every joint and opening that the engine and gearbox have.  (That's a slight bit of an exaggeration, but not far off from the truth, and please remember I  am  trying to put what humor I have to its best use). 

My International puts my '67 R.E. Interceptor (also affectionately known by some as the Royal Oilfield) to shame for the amount of oil that's leaking out of  my  International.  I remember as a youngster, when Japanese bikes were well into making their debut hearing from old timers how they didn't leak oil like British motorcycles.  My first British bike when I was 17, being a '67 BSA Lightning, the little amount of oil that it leaked made me doubt the veracity of these old timer's comments.  And my '74 Commando I bought new in in April 1974, leaked  no  oil (nor does the '74 i restored leak oil) so the old timers  had  to be exaggerating.   Both of my 1927 H-D JD's that I've built literally leak a mere drop or two regardless of the number of miles they are ran or how long they sit.  I thought I had a pretty sturdy constitution when it comes to motorcycles leaking oil, but my Inter has raised the bar and is shivering me timbers, matey's...  When a well-intended Norton Facebook member told me to wear black pants when I ride my International, I thought...  "Yaah."  "Right..."  "That's only an affectionate exaggeration on your part in a cheerful attempt to humor me..."  "Good for you to wear black trousers, not me..."  Thankfully, I've been wearing black jeans for decades and have several pair on hand.  Forewarned  is  indeed forearmed.   Having owned a number of British pre-unit singles in my earlier life did not prepare me for my present day International ownership.  I expected to see  some  oil leakage from places International's are known to leak, but not the amount that seemingly rivals the blowout of an oil well.... https://www.youtube.com/watch?v=VGoKmemlfoo&ab_channel=MikeVickers 

To those who skipped to here, please read the following...  (:   

The most distressing leaks are at the bottom and top of the bevel drive housings and the vertical shaft tube itself.  I literally can watch the oil slowly seep out from those joints.  Earlier this evening, having read here in "Models" that the International "...sadly received virtually no development beyond 1936." (and) "Nothing was done to improve its poor reputation for oil leaks either; owners had to seek their own remedy."  Ouch!  Having read this in our club site, I am more of a believer and still somewhat of a skeptic that an International should leak oil as well as mine does.  Since my 3 mile test ride Sunday last, I have been hearing sounds from my curious self such as, "Huh..."  "Hmm..."  "Huh..."

Looking in my '37 and '46 Spare Parts Lists, having always thought that this Yank was pretty clever interpreting the intended meaning from descriptions made in the British vernacular, right about now, I'm feeling quite humbled.  In the both Spares Lists I see the terms such as "packing washer," "housing washer," "paper washer," and "cover washer." 

Are some of these "washers" metal shims and others paper gaskets?  I fear to deduce; therefore I humbly defer to your experience and wisdom.

Might  these upper and lower housings have paper gaskets fitted?  And/or a metal shim aka "washer?"  (I ask this because I note in the '46 Spares Lists there are 2 items  depicted  appearing as perhaps a paper gasket or metal shim for the housings and only one of these items is given a number to reference the part number and description of the part).

Does the top and bottom "rubber ring" for the vertical shaft tube perform its intended use well?  (As it is, beautiful golden oil runs down the tube like a rivulet formed from melting snow in the warmth of springtime sun).

All jocularity aside, where should the Inter engine  not  leak from? 

Or...  Are these leaks another one of the features of International ownership that I shall endear and adjust myself to?  If so, then no big deal, I shall do it!  (I'm too dumb to give up so easily).