My opinion? How you fill/check the level is critical. Per the manual, put the FJR up on the centerstand while the engine is running. Only turn off the engine after the bike is up on the centerstand. Wait a few minutes and check the level. That is the only way to get consistent results.
Do NOT shut off the engine, and then put the FJR on the centerstand to check the level. It does make a difference.
Wouldn't this mean that some amount of oil is going to stay up top and not drain down? I'm just asking cause with my previous bike that would happen and you could easily over fill it.
With it you had to let it sit on the side stand for a minute or two so that oil could drain down, then put it on the center stand to get a level reading.
If the Fejer drains better then I dunno...
This is another reason to change your own oil. You can can figure out where full is on your site glass because you put in "the right amount" and know where full is.