I prefer to leave them with the standard grease. Once you start flushing them out and oiling them they wear out pretty quickly. That's why I don't buy the expensively un-lubricated bearings!
I doubt any manufacturers are putting a silicone grease in there, it would be very draggy. Something like 3-in-1 or a specific bearing oil would be the easiest for you to use at home.
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