Dow33 or shocker lube only, anything else and you're taking a chance with your o-rings then it's leak city....
For instance I use tri-flow on my automag (old mechanical marker) and it runs a treat but I wouldn't even dream of using it on my Ions or angel as it could rot the o-rings.
Bascially any mineral based oil / grease is a no-no and I'd give the vaseline a miss too.
If your marker was new didn't you get a little tube of grease with it?