magura and shimano * use mineral oil, dyed blue and pink respsectively, all other makes use DOT i.e. car brake fluid.
it is commonly stated that using the incorrect fluid will damage the seals but i have yet to hear of anyone doing, either it does not or nobody has tried it, or they have and did not post about the result.
I am only aware of those 2 makes, but feel free to add to the list.