The internal parts are probably plastic so it`s better not to use oil. (just a guess, could be brass or some other material also)
hi,
The internal parts are from steel.
I broke one two years ago.
My dealer also told me a few years ago that this part is not new for sale anymore, but on ebay i already bought two.
To my opinion you'd better not oil it because it will leak out and could get on the front tyre.
use the thick brown grease (there are special grease pumps to insert the grease)
