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I’ve read it’s a different viscosity and not compatible? Would you go as far as mixing it? Haven’t been able to find a small bottle of Shimano oil in stock for ages but still have a bottle of the magura stuff and I need to shorten a hose and don’t want to be caught out when I inevitably cock it up and need a bleed.
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There are differences between the two in composition. The Shimano fluid has a higher boiling point. Does it matter and can you mix them without weirdness? Probably not and yes...but I'd avoid doing so if I could.
Find someone online who's done it. Don't take their word for it if they have no front teeth.
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I'm sure they all claim that their own particular brake fluid is sprinkled with magic pixie dust, but one will work in the other. Personally I'd avoid mixing the two, although I doubt that in practice it would be an issue. As I said, if you need a small bottle of Shimano oil, let me know. I have some spare.
Magura Royal Blue fluid is the same stuff. Just a different colour. If you really need a wee bottle of Shimano fluid I have some spare though.