jer, I raised my fork oil from 135 to 128, on my 2001 yz250, and made a noticeable difference, in ride height, and plushness. ( as the fork now rides up in the softer part of the stroke, meaning less spring tension) It made a world of difference to me.
So maybe the older forks arent so noticeable? but the new stuff, you can really fill the difference, It think that before I changed the oil height, it may not of had the 135mm like it stated in the book. but the fork was much harsher, and the fork didnt sit as high ?
On my last years bike the forks were way to soft, after break-in, so I installed .44kg springs, and changed the fluid to 120, and it was to stiff at the first part of the stroke, I changed the oil to 125, and it was better, but still felt a little stiff, at the first part of the stroke, so I went to 130 mm of 01 oil, and it was real nice, So this is were I am coming from, with my spec's, that you called NG, NFG, etc, So as you can see I spend alot of time on my fork spec's to get things right,( I ride every saturday) As for the mobile 1 ATF, I dont dissagree with your spec, I just dont think it is valved for that oil. but I wouldnt post back on public forum "NG, NFG, etc"
Enough Said !
See ya Coop