Yes, I know that about the old line synthetics. Supposedly Valvoline has a 'new trick'.
"..is recommended for all ABS, hydraulic and drum braking and clutch systems requiring DOT3 and DOT4 fluids. It's premium,
synthetic, low moisture formula provides superior anti-vapor lock protection. Has a high dry-boiling point, 513 degrees, that reduces the risk of fluid vaporization and possible brake failure. Exceeds all SAE and FMVSS brake specs. Surpasses all OE specs and WILL MIX WITH CONVENTIONAL FLUIDS. Wet Boiling point 333 F."
I added the last capitalization, as that is an important point as the old lines of
synthetic brake fluids (DOT 5) would not mix with conventional fluids, nor did they meet oe specs. I found out about Valvoline
Synthetic at the SAAC Mid America Nationals, where it is in common use among the raod racers that are on the SVRA circuit. I asked a few competitors about it because I had heard that DOT5 was not suggested. THIS IS NOT DOT5 TYPE FLUID. Before running it in my GT350 or the Cobra, I also called Tilton Tech and Wilwood, who both gave it the ok. As an aside, at the last NASCAR race here, it was being used in Mark Martins car when the had to bleed the brakes, so it is NASCAR ok too!
It has been in all my cars for over 2 years without difficulty, and has been in use at my old shops (4 retail service centers) for over a year, again, without any problems whatsoever.