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depends on climate. in high-humidity environments, it's wise to change the fluid once the oil begins to darken as most brake fluids are barely golden in colour. there are test strips available to test the fluid for the 'geeks' out there. when changing the fluid, it's wise to use a good fluid like Castrol LMA (which is low moisture activity). also, don't go thinking that buying the huge gallon jug of 'brand x' fluid is great either. technically once the seal is broken on the bottle, the brake fluid is 'contaminated', so buy several of the smaller bottles if you plan to keep some around. i buy the medium sized bottle if i buy off-the-shelf. i usually use the Castrol LMA or Valvoline/Pyroil fluid to flush my lines before i fill with ATE Super Blue or Motul. i recently brought a few small bottles of the AmsOil synthetic (non-silicone) fluid to try in my truck.
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