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Brake fluid question

Discussion in 'Non-Z Related' started by TWIN TERROR, May 10, 2018.

  1. TWIN TERROR

    TWIN TERROR Active Member

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    Are all dot 4 brake fluids the same. My daily BMW X5 is due for a brake fluid change and BMW don't give a lot of info except use theirs $$$. Most other oil/fluid manufactures say to refer back to BMW. Penrite say to use Penrite Dot 4 esp or super dot 4 but have been unable to find anyone stocking it in my area. Would any super dot 4 do the job or does anyone have any recommendations for a suitable fluid to suit a 2008 x5.
    Cheers
    Dave
     
  2. MagicMike

    MagicMike Mod and Event Coord [QLD] Staff Member

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    There's actually been some good info on brake fluid here in the past.

    If I recall, dot 3 and dot 4 are compatible, dot 4 being more heavy duty. Both are compatible with dot 5.1 which is on another level again.

    Dot 5 is not compatible with any of the above.

    Get whichever dot 4 is cheapest
     
  3. Chrispy

    Chrispy Pretentious Upstart

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    I do what Mikey does, Dot 4. Apparently dot 4 absorbs water a little quicker than dot 3, but most modern cars want the dot 4.
     
  4. rob260

    rob260 Moderator Staff Member

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    Ditto I just keep a bottle of Nulon Super Dot 4 handy. Goes in anything and everything.
     
  5. Fists

    Fists Active Member

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    Not all the same, wide range of boiling points but all compatible outside of temperature requirements. It's like octane really, putting 100 octane race fuel in a hyundai getz wont help a diddly but putting 91 in your 20psi race car will not be a good day.
     
  6. TWIN TERROR

    TWIN TERROR Active Member

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    Cheers all. Looks like the Nulon Super Dot 4 will do the job :) at least I can get it locally.
    Thanks again
     

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