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Seems a few (claimed) mechanics have done the baby oil and it was fine... But I have done the lhm/lhm+ in the past and has been fine to the best of my knowledge. Now that lhm is expensive (as I have run out) was looking the hydraulic oil used in trolley jacks.
lynx-
I did not sign off on it as I've never done it myself. 1L bottle of Shimano fluid is cheap enough so I'll never ever have to bother using anything else.
Hence my caveat of replacing it as soon as possible, maybe I should give it a good go with baby oil and report back?
Got 2 spares to rebuild so might just do that.
coventry_eagle
It's a known bodge which works if needed, that said, flush it out and replace as soon as possible.