Have anyone tried to completely submerge Avalon into mineral oil? That works very well for desktop computers.
Fluid would be too viscous for the fanz...
I've got a system that's submerged in mineral oil (quad E5-4650). Transformer oil to be specific (lower viscosity, higher flash temps, mostly synthetic, no PBAs). Fans don't really care, although that's not the primary circulation method (pump).