Oil for the Schlumpf

As a soon to be Schlumpf hub owner, I think starting this thread is a good idea.

Here’s what I’ve gleaned so far.

According to this post:

And this one this post:

The only reference to oil I can find in the Schlumpf manual is:
“please remember, that the hub has to be lubricated once or twice a year with some bicycle oil or our special grease”

No details how much oil to use. That seems like some key information that’s missing from the manual.

I would never have thought to use sewing machine oil or transmission oil.
With the manual’s suggestion of “bicycle oil”, I’d just buy a small dropper bottle of Finish Line or Pedro’s bicycle chain lube at my LBS.
Any reason not to use these products? Is something better? Why?