Today I serviced an inexpensive Formula low flange loose ball front hub that has never been opened since June of 2002. FOURTEEN years. I found plenty of grease and it was sill clean as a whistle. The bike has been used a lot over those years. I wish I knew what brand of grease that was, because it was fresh as new. Clear and slimy. There are redundant dust seals on the hub and they seem to do an incredible job of keeping contaminants out.