This isn't the good stuff--it's only the Extra Performance level. There are also High Performance and Super High Performance levels of fluids, though the latter is only available for F1 cars. (It's the wrong size for everything else.) Most little old ladies have to run High Performance all the time so as to keep the left-turn blinker from burning out. I find that if I run with the EP level, it works great as long as I change the blinker fluid filter regularly, or install the appropriate K&N drop-in filter. Of course, filter changes are a real b!+@&, given that the filter housing is positioned up behind the exhaust grinder.