On my 2009 street glide last primary oil change I noticed oil was a brown to reddish color ,and there was no change in the fluid level,, the fluid used was Amsoil Synthetic 75-140 I use it in both my primary and trani, I have put about 1000 miles since last change, I rode today and noticed a chatter or vibration at about 52 mph when there was no load on the drive train , as soon as a load was put on chatter disappeared, made me think something to do with primary chain, I did the the gear,, brake adjustment, no help, got home after 200 or so miles checked the primary fluid ,brown red again, Chain seems fairly tight as i can move it with a long screwdriver, I can see the wear puck where the chain sits on it and it is not buried in the puck , so that cant be wore to much, Bike has about 2000 miles since the compensator kicked and broke a ring gear tooth that was caught and chewed the stator,rotor up, But H/D replaced the clutch assembly Stator and rotor to the S/E heavy duty unit, So total maybe 2000-2500 miles since work was done, Any Idea about the red brown color? Clutch plates?? Clutch feels fine .Any Help Greatly appreciated, Should I pull the primary cover off , how would I tell if the plates are defective ? I know if I pull it off the chain will look ok , to my eye anyway,, Thanks again for your help