Fork oil - amount, specifications ?

[midden]

Sorry for the late reply,but i wanted to "feel" the bike before i  give a feedback.
As many before me have said,the 15w i believe is a "must" uprgade.At least for those who ride at bouncy-shity-not so good roads like me,here in my country.
I also upgrade my hadlebars,from renthal's ultra low to lsl's street bars,and the feeling i get from the bike is the best i ever got from it.Ofcourse sag settings were checked.
The lsl bars have less sweep and are lower than renthal's and with the stiffer front end it became spot on for me!
I plan also a future spring upgrade,as i like the positive upgrade of the front end.
As for the bars,i have an ktm's superduke headlight conversion,so i dont know if they will interact with the fzs fairing!
Overall a big YES from me!

playing devils advocate:  wouldn't replacing old degraded 10w oil with fresh 10w oil give a improved feel anyway and if the case then any advantage gained in using 15w would come as extended service intervals