Servicing of small Aftermarket Oil Breather Units
 

Just a quickie, I fitted a small aftermarket crankcase oil breather filter unit.. junking all the underseat / rearend pipes etc...

1) because my underseat breather box cracked

2) because it neatens up the rear end of the bike...

However I did notice that after about 1kmiles it you can see the black oil in / on the filter, do you need to service the filter, cleaning it every so often, or is this just normal and no further action is required?