harley sells fork oil in 16 oz. containers for the same price that metric bike dealers get for a 32 oz. container. I use ATF which is just a little heavier than 10 w. fork oil in both my Dyna and Electra Glide.
A little stiffer, mostly unnoticeable except when braking. I've been using it for 20+ years in the Dyna. Just changed the Electra Glide.
Boy, does the stock Harley Fork oil STINK when draining!!!
cool ill try the atf next time. i was riding on some dirt roads and my forks bottomed out a lot , knocked off the wind screen. i installed progressive springs not long ago but they were of no help on those dirt roads. ihave 10 wt oil in there now was going to try some 20 wt.