I think the guys at Vorsprung suggest to do this too when you install their aftermarket air piston. Like Cary says, I've done it sometimes and sometimes I haven't...didn't feel different one way or another.
I think you want to put oil in the air chamber when you're doing a full rebuild, especially when you have the air top cap off already (and you wouldn't be going through the valve stem). You don't necessarily need to do it when just servicing the lowers, as demonstrated on the Fox video.
Float fluid is great stuff and will reduce friction, even on a fresh service. I always use a small amout as my secret sauce. After a couple hundred miles ill add a few drops to the air chamber to get it moving like new again.
yes it does migrate. Don't use to much and after a month or so you need some more. Its worth the silky smooth action imo.
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