The manual recommends Dot 3 mineral based, but there is no reason not to use the latest Dot 5 silicone fluid, and a couple of good reasons to go for the silicone. First, it won't bugger the paintjob on your tank if you splash it, (it actually makes it shine!) And best of all, it's not hygroscopic, so doesn't let moisture and rust form in the hydraulics.
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