oily

Is it possible to have a seal go bad on the rear shock? It seems like there's some oily substance on it that looks like maybe dried suspension oil..??

I saw quite a few air filters with palm-sized oily dirt stains from FZ6R (source: youtube, etc.). I checked mine yesterday, it was the same thing. It makes me wonder if the intake system design was flawed so that it allows oily dirt to get in?