Care of Muhle VIVO brush with plum wood handle

I received a wonderful brush from my mother-in-law, Martha, for Christmas: the Muhle VIVO black fiber synthetic with a plum wood handle. She is very generous and she kept after me asking if there was any shave-related items I would like, so I gave her a very specific suggestion. :)

Here are the glamour shots of the brush:





The wood has a texture that made me concerned that it was unfinished. When it gets wet (unavoidable, of course), the wood looks darker.

I was concerned about the care and maintenance of this lovely handle, so I wrote to Muhle asking how the wood was finished, and how I should maintain it. I was pleased when I got a prompt, helpful reply from Christian Müller:

Quote:Dear Mr. Allen,

Thank you for the message.

The wood is oil treated and it is recommended to renew this from time to time by using a regular kitchen oil, (olive oil, etc.)

mit freundlichen Grüßen / best regards,
Christian Müller

MÜHLE / Hans-Jürgen Müller GmbH & Co. KG,
Hundshübel, Hauptstrasse 18, 08328 Stützengrün, Germany

I certainly can do that, but I was wondering if anyone here who has experience making and finishing wooden handles could give me advice? Should I just follow Mr. Muller's official recommendation and rub the wood with a food-grade oil? I would feel better if I gave it a finish that was more water proof. Would it be a mistake to rub on tung oil or a tung oil finish like Homer Formby's?