Well I cant speak to the other manufacturers but for some additional clarity the owners manual from my brand new HW50 states the following and i do not see any sort of oil offered by Weihrauch on their website or their current catalog.
" The lubrication of your system (piston, piston seal, main spring) was already applied during assembly. With normal use it has to be renewed when the piston seal or the main spring have to be exchanged. " (presumably by an authorize service provider)
So I would say that if you are trying to keep the gun stock and without modification to stay within factory warranty coverage then I would stick closely to what your owner manual states as far as if additional lubrication is recommended or is acceptable.
If whether or not a drop or two of chamber oil would do any harm who's to say, perhaps it depends on the gun and the materials used in its manufacture.
All of Beeman springers made by HW in the 80's and 90's used chamber lube as part of their maintenance. I still have a set of the Beeman oiling needles.
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