Loco obviously know his stuff and quite rightly recommends you use OEM fluids specified by the manufacturer.
But the likes of fox and rockshox do not make / mix there own oils. They buy a specified grade from a bulk manufacturer, stick it in a fancy jar, colour it blue (fox) or red (rockshox) and whack on a premium.
Float fluid is nothing more than 80 wt gear oil.
As loco says you need to get the correct oil for lubrication (in lowers, springs and wiper) and the damper (damping oil has anti foaming additives).
Motorbike fork oil is for the damper side.
If the forks are new and in warranty I would stick with the recommended fluids. If not, then get alternatives. You will service more often which is a good thing. I do my lower legs and damper every month or so.