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Silicone Brake fluid

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Trigger:
Have had someone ask me to service his brakes but, they are insisting that I use DOT 5. My supplier only lists 5.1, is there any difference ?

RGP750:
Found this Trigg

Image result for difference between dot 5 and 5.1
Since DOT 4 and 5.1 are both glycol-based brake fluids they are compatible with each other, which means they can be readily mixed without harming your brake system. It is important never to mistake DOT 5.1 (glycol-based) with DOT 5 which is silicone-based and should never be mixed with any other DOT fluid.

Trigger:

--- Quote from: RGP750 on January 15, 2018, 02:52:11 PM ---Found this Trigg

Image result for difference between dot 5 and 5.1
Since DOT 4 and 5.1 are both glycol-based brake fluids they are compatible with each other, which means they can be readily mixed without harming your brake system. It is important never to mistake DOT 5.1 (glycol-based) with DOT 5 which is silicone-based and should never be mixed with any other DOT fluid.

--- End quote ---

Interesting, but why not just use DOT 4 ? Any benefits to using 5.1 or draining the whole system and using DOT 5 ?

Green1:
The only benefit I can see with DOT 5 silicon based is its kinder to the paint and supposedly doesn't need to be changed as often.
I think it also has a higher boiling point not that that's ever an issue for road use. 

Moorey:
DOT 5 is hydrophobic. So doesn't require changing as often and doesn't damage paintwork. Allegedly.  :)

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