We put the specified measure of 20wt. fork oil in -----'s 2002 Bonnie with 36,000 miles on it and it works great. I used some
Amsoil 7.5 wt. fork oil in my Thrux with intiminatiors and h-d springs, and put 10wt. in my T100 that has heavy duty springs-cant seem to tell the difference-all...