Perhaps you should look into the process of diffusion. Diffusion does not mean that the brake fluid is mixing. It's like when you drop an easter egg dye tablet into a cup of water. The color diffuses in the water in an effort to balance the concentration of the dye throughout the water. It doesn't mean the water itself is moving around, just the dye.An update: Just came back from a 200 miles trip didn't drive daily since the first refill, I emptied the reservoir again and it was green and dark like I never changed it from two weeks added new clear fluid. I don't know what everyone is talking about Fluid does mix and I'll guess I'll follow up with changing every few hundred miles until it's relatively clear and clean.