Japanese fan clutches are the few that I've seen that come apart making a refill possible, However gear lube would be too thick when cold ( fan locked ) then too thin when hot ( fan freewheeling). Liquid silicone is what the factory clutches use.

Off brands are an unknown. Sometimes you get actual auto manufacturer parts with the logo / part number ground off. I've bought 4 motor mounts from a off brand maker that were actual MB parts. However expect some consolidation, the sets were bought a few years apart for different cars, had the same number on the box but different part # on the actual mounts.

Parts like this hit the market when an auto supplier / auto maker is clearing out inventory.