http://f800riders.org/forum/showthre...ork-Oil-F800GS
"Planning to do the fork oil this week on my 2009 F800GS. From what I understand the 7.5 W is stock and I am thinking about 10W however, not sure if it will be a noticeable difference. I have read other comments regarding less oil, more air, 15W and now am a little confused as to where I should be with this oil change."