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Is it Citroen suspension oil that's identical to it, but cheaper?
Yep. I bought a litre for £3, and its running in my brakes fine.
5wt motorbike suspension fork oil.
Been using it in Maguras for years.
Baby oil
Been using the Citroen brake fluid for the past few years with out any issues.
LHM+ is what I used on numerous sets of Shimano's - all fine. £4 for one litre, rather than over £4 for 50ml of genuine Shimano stuff.
LHM+ is the same stuff, I got Motul LHM oil which was more expensive than Halfods stuff but has a higher boiling point
Currently using some LHM which works most brilliantly along with a good bleed.
Have also used Jack oil, and 3 in 1 when slightly stuck and needed to ride.
Another plus for lhm