Hi Rob, Could you elaborate on this "compressible liquid" of which you speak? See ya, Arnie On Mon, May 18, 2009 6:14 pm, Rob Skinner wrote: > > DOT 5.0 is silicone based, and you can not mix it with the others. > 5.1 is several times more compressible than glycol based fluids and > can allow a spongy feel.