• I'd imagine it's full of Shimano oil if you've had them from new and never done anything to them, I don't know if any reasons you shouldn't be able to mix them, different coloured oils might end up looking horrible but the epic stuff looks pretty much identical to shimano. If you're worried you could pull a drop out of the lever and mix it with a drop the new stuff and see if it explodes or summons daemons.

  • I'd imagine it's full of Shimano oil if you've had them from new and never done anything to them

    I took a drop out and the fluid in there is clear/slightly yellow. Wasn't sure if all Shimano systems use the same type of fluid, so if there's no issues mixing I'll just top up. I was more concerned with different fluid contaminating the joints and causing corrosion or something like that, but if it's not an issue, that's fine.

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