For those who use valvoline synthetic brake fluid, just a warning to all. They DO NOT LAST as long as other race fluids or even the OEM fluids. I had the OEM fluids for my first track event, the fluid came back all clear. On a cooler day with new valvoline brake fluid, the fluid came back brownish after 135 miles. I dont have any technical data to back it up, but common sense tells me that the fluid is breaking down. I just want to warn those who plan to race their cars with the Valvoline fluid in their brake system.