LittleG

Lol cute, Thanks for adding value to a discussion.

Sure. Apologies for the spelling mistake, lets see if I can make you a little less sceptical Correction on my reference to 2.5w fork oil, it should have read 5w. Go check the specs page on this Document around Motorex 75 hydraulic fluid. http://www.motorexusa.com/tech/hydraulikfluid%2075.pdf Go check some of the details on fork oils here - https://transmoto.com.au/comparative-oil-weights-table/ To keep it easy for you the numbers for Bel-ray 5w fork oil: So some facts,1. Mineral oil.2. Similar at 40 °C 3. Exactly the same at 100 °C 4 Has a little lower overall Viscosity index (but still relatively decent number). So far I think I have covered most of the potential danger points, I don't claim to be an expert so this is just rehash of some quick google searches, so I am keen to see if anyone has more info because that way we can make more informed decisions rather than just 'oh the sticker says ONLY MAGURA BLOOD' @ R1000/L.

Why? Always interesting to hear the warnings without much to back it up. DOT fluid is aggressive stuff and damages the seals, most of the other stuff mentioned won't, the difference might be in Feel of the lever or issues with heat etc. Have not seen anything here other than 'that isn't what is recommended by manufacturer'.

Motorcycle Fork oil should also work, we use it as an alternative to Motorex mineral oil on some of the off roads hydrolic clutch systems. I use Bel-ray 2.5w which can be bought for R120/L. Figured I would use the same on my Mtb...