I use the Max BMW fiche for my parts reference; their fiche is easier to work with than A & S's. I suggest you check there so we are on the same page.https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51765&rnd=07242017
The lower end of that mount that you have linked to, called the 'Base Support System, Lower', attaches to a bracket that is shown on illustration 46_0376, item 5. Item 5 is bolted to the bottom of the crank case with an M10 x 90mm fillister head screw (washers, nut, etc.) that is shown on illustration 46_0377 as item 15. I don't remove that screw to remove the 'Base Support System, Lower' which is 46_0376 item 4, BTW, although I did replace that bracket (item 5) previously without any leaking oil. I remove the two small bolts shown as item 8 on 46_0377.
Now... if you are referring to the chrome 'Rod Left', 46_0376 item 1, then you will see that it is bolted to (I believe) the center stand bracket (un-numbered on illustration 46-0377) which has a captive cage nut on it. Again, no oil, but the other end of it isn't attached to the 'Base Support System, Lower'; it attaches to the chrome crash bar.
None of the bolts retaining the 'Base Support System, Lower' go into anywhere there is oil, so I am at a loss as to the problem here. Mine is a 2004 and I presently have all that stuff off the bike to do an alternator improvement and clutch replacement.
What's different about yours??
Does this help at all?