Castrol makes a real good brake fluid, should be gold or platinum colored for what it costs, but it does hold up, I think most of the Cup guys use it, that's where I get mine, but I did have to buy a qt once, that'll make ya dizzy/er! We also used Harley Davidson blue for a long time, but a pint of that'll chill ya also! I just ckd, looks like we're using Wagner "Severe Duty" now, which has done a great job, a non-synthetic fluid, available almost anywhere, has a DOT rating of 5.1, and a 500f/260c temp rating. As I recall, the Blue Harley stuff was silicone, and trying to bleed it in cold weather, produced what looked like nylon string out of the bleeders, not so good! Bob