Fluid for Lever Shocks

[Doug_Cameron@icoc.org]

newbie here...do I need to use the specific "shock fluid" in my lever
shocks (from Moss or other place) or can I use a reasonable substitute
easily found in my local auto parts store?

Also, my front lever shock appears to have a filler hole on the side of the
shock, near the top, but in pictures I see the filler hole on top. Am I
looking at the wrong thing? Thanks! - Doug