On Sun, 10 Oct 2004 23:40:04 +0200 (CEST), Nomen Nescio
> wrote:

>snip
>First of all, why do they even call this stuff, "fluid", when it is really
>a hydraulic oil? But more importantly, is there any fundamental difference

"Fluid" sounds more impressive, implying it was specially formulated.
The word fluid is a general term for either liquids or gases as
opposed to solids. Air and water are both fluids, but air is a gas
and water is a liquid.