Could the dribble of oil on the chain be a way that the manufactor has to make sure your chain has enough oil and never gets rusty.The more I know about chains, the better I like belts and shafts. My HD has a cool setup that constantly dribbles engine oil on the chain where it enters the primary case. It's really fun when your date arrives on the back of your bike with a black streak of oil up the middle of her nice (formerly) white shirt.
Maybe soon people will be wanting clothes like yours with a black oil streak on them. After all they now have faded jeans and jeans with holes in them.