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It helps reduce stiction. Tight dust seals is certainly a thing but its usually poorly looked after forks that lead to shitty feeling forks.
My forks feel perfectly fine after a fresh service since the foam rings have been freshly soaked in oil. But after a few weeks of riding, using something like the ext lube on the stanchions helps keep them feeling fresh.Why am I immediately thinking of OFC Monster hifi cables...
I'm quite a cynical person and love to dismiss snake-oil pish but lubing fork stanchions is nothing new!
It comes with a little plastic pick, you use it to pull the dust seals back a bit and squirt in a couple drops. It’s definitely good shit, just comically overpriced good shit.