Specs on how much fork oil is needed for a 1995 gsxr 1100 w

SOURCE: will plasitcs from 1995 suzuki gsxr 1100 fit a 1990 gsxr 1100

No They are Different They Wont fit..

SOURCE: 1995 Honda Shadow Vt 1100 fork oil type and

My repair manual and local shop specify 15-16 oz per tube. weight can be changed to suit your ride quiality preferences.

SOURCE: fork oil

turn the bike up side down

SOURCE: GPZ-1100 1995. Changing oil in

level of fork oil is more important than the amount...it should be 120mm from the fork top when fully compressed without the springs.
But if you want an amount then you're looking at 470cc although this will depend on wether the fork internals were stripped and dry before refilling. That's why using level is a better guide.

Engine oil for the 11 is 10w40

SOURCE: How to Replace front fork seals on Suzuki GSXR 1100 K model

Remove front wheel, brake calliper etc . Undo top and bottom yoke pinch bolts and slide out fork leg. Clamp chrome tube in a soft jawed vice and remove top nut carefully as it is under some load and will fly away, (but its not too much you can hold it with your hand). Tip out remaining oil slowly so as to not loose spacer on top of main fork spring. Clamp lower aluminium leg in vice by calliper mounts and remove allen screw in extreme end (if the wheel spindle was in you couldnt see it) This is the only part that might be a problem as the inner end may turn. An impact wrench may help or if not a simple broom handle shoved up the other end is often enough. Once this bolt is removed the leg will split. Now lever out the dust cover to reveal the wire circlip holding in the fork seal. Remove the clip and lever out carefully the old fork seal. Fit new seal using a large socket and mallet or something similar and reassemble in reverse order, not forgetting to add correct amount of new fork oil.