I think as Skidpan suggests, specific make and model forums not associated with the maker might be the best bet, there's always a way to change the oil if you wish.
I'm also tempted to ask what's 'life' expectancy on a sealed for life box, other makers have gone down this route before but have revised their advice following the short lives some boxes had in the real world
Make specialist indies maybe having their customers best interests at heart (others may think differently) paid no attention to the SFL fashion fad and serviced them anyway despite the makers advice of the time.
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