Hydraulic Fork Oil?

I have a set of hydraulic forks on one of my bikes and they are way too soft.
If you have Hydraulic forks what oil are you using and how do you change it?

Cheers,

Blue

Changing the oil will only affect the dampening effect, if they are too soft then you need to firm up the springs. Do this by either fitting stronger springs or increasing the preload by use of spacers.

Springs?

Oh err, thought it was just oil and I thought changing the Viscosity of the oil did the trick?
They are after market jobys like the ones from OORacing http://www.ooracing.com/store/images/up ... nt_end.JPG

I know Tufty has these, you there fella?

I kind of get how to change the oil but did not want to jump in with out asking 1st about your experiences

Tufty?

You were going to tell me how to this do and avoid the pitfalls?

You there fella, or are you stuck in the shed with that engine rebuild?

Blue