They use 5.1 same as Hope and others do, but can use/mix with 4, for it's better heat dealing with properties compared to mineral oil, but it is horrible.
Yeah I've never found heat an issue. Ok once I boiled my shimano but that was on a horrible descent and I dragged the brakes all the way down.
I wouldn't mind the dot if they were easy to bleed.
@snottyotter started
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They use 5.1 same as Hope and others do, but can use/mix with 4, for it's better heat dealing with properties compared to mineral oil, but it is horrible.