I found this in a HD forum about the weights: https://www.v-twinforum.com/threads/...ork-oil.48896/
That 40w was something I got from Spectro (never used) that was rated as "Type E".
I gather that from what Dave Moss' videos that heavier guys (like me) need heavier fork oil to help with damping. So, maybe 15w or 20w might be good.
I like the way my forks are tuned at present, so I'm erring with the 15w just because I don't want to make a radical change to the way my forks are working but this is my first Buell and I'm hoping you guys have some input.
TIA.