For 2010 Fox made the switch to 10 wt. Suspension Fluid for all their fork dampers. We've been told that all of their older equipment is backwards compatible with the new 10 wt green fluid except for the old X forks (first generation Terralogic). All Fox forks with a FIT cartridge damper and 2011 Terralogic will use the Red 10 wt fluid. We have both versions here in a 32 oz. bottle.