My understanding is o-ring chains are sealed by the o-ring, the lube won't get in and the original lube won't get out, protecting the pins. The rollers need the lube so when the chain comes in contact with the sprocket it rolls on eliminating friction and wear. A dry roller won't roll, and will cause excessive wear to itself and the sprockets.
Sand and dust stuff any chain as mentioned. A rusty chain wears itself out. That's what I've discovered over the year's.
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