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My guess would be 10 weight.
It could be that they use regular motor oil in China. I would reason though that if the fork assembly is a copy of Japanees modle that it would benifit from the use of a specific fork oil.
Not sure how easy it would be to drain the fork oil out, but you could probally tell where you ant to be after a couple of tries. Maybe while you have the forks off or apart you could come up with a hose the proper length/diameter to suck the oil out so that a different weight could be added.
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