Depends on how much it is weeping. If you can live with it and make sure your oil level doesn't drop too low from it, lots of people ride with bad leaky seals for some time as long as it isn't contaminating anything critical or leaking on the exhaust and possibly causing a fire. this is opposite the exhaust so if you can live with it for awhile and it isn't dumping oil on your rear tire, you should be able to just watch it and replace it at a later date unless it gets worse. With the coverings, it isn't very visible. My opinion of course.Just noticed my sight glass is weeping. Is this a major concern?