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DOT 5 and DOT 5.1

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rhodyspit75 Avatar
rhodyspit75 Ernie Connor
Cumberland, RI, USA   USA
I just went to two auto suppliers looking for DOT 5. Both of them tried to give me DOT5.1. Luckily I had done some research earlier and found that they do not mix. Neither one knew that. They thanked me for the info.

Be careful.

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pixelsmithusa Avatar
DOT 5 is silicone; DOT 5.1 is Glycol based with a higher boiling point. Definitely not compatible.



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Edited 1 time(s). Last edit at 2018-05-14 12:24 PM by pixelsmithusa.

dkbmotorsports Avatar
dkbmotorsports david boutelle
hamden, CT, USA   USA
i personally do not like dot 5 it's design is for aircraft. if your lazy it's good because you do not have to flush out the fluid all to often but for me that's not a hard job to bleed brakes.
they designed DOT 5 to combat the problem of a aircraft coming down from a high altitudes and having very think brake fluid from being in the sub zero temps and not having time for the fluids temp come back to a working temp before you have to use your brakes to stop an aircraft.
what i do not like about it is being silicone based it has more compression then a glycol fluid has. your average person will not notice it as the peddle will still get hard when your pressing on the brake. it will just have a little more peddle travel before it does so.
with the DOT rating a 5.1 does not mean it' offers a higher boiling point then a DOT 4 though most do. some thing like Motul RBF 660 or 600 DOT4 has a higher boiling then Motul's 5.1.
because i race i use the Motul 600 in my race cars and the Motul 5.1 in my road cars. as they do offer a higher boiling point then the other DOT ratings even a DOT 5.

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