I surmised that the DOT 5.1 C brand is the Bosch ES16-32N (DOT 5.1) based on its kinematic viscosity numbers at -40C. I've attached two links.the second gives you an idea of the brands uses, but the study does not explicitly say which is which. The ? Bosch ES16-32N showed the highest boiling point for wet (4%) fluid.The DOT 3 LV (I believe this is Dow Brake Fluid 372LB) shows the best viscosity at very low temps (of all the fluids tested), the least water uptake, and very low corrosion numbers.It looks like the DOT 5.1 will replace the silcone DOT 5 standard for the military.Corrosion results on the various fluids (other than 1 of the DOT 4 candidates) show excellent results on all the fluids.DOT 4 doesn't look so good in their tests.They test EPDM vs SBD rubber parts/seals for swell/hardness and my interpretation there is that it's a wash.This research confirms more or less confirms that DOT 3 absorbs less water than 4, and DOT 4 less again than 5.1.The study really clears up some ambiguous information floating around on the interwebs. I found some nicely detailed and recent (2019) data from a study conducted by the US military to evaluate DOT 3, 4, and 5.1 fluid as an ABS friendly alternative to DOT 5 (silcone based) which does not work with ABS systems. We also see winter temps that can dip below -35C, so choosing a fluid with very low viscosity at low temps makes sense. The one I'm most concerned about is our 2018 LEAF EV which calls for yearly fluid flushes, and has a very expensive integrated electronic braking system. I have been researching brake fluid for a bit now to determine if a switch from DOT 3 to DOT 5.1 makes any sense for our vehicles.
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