Like the title says... but I was wondering about something.. Would it be at all pheasible to paint a whole AFV with oil paint, or is that just too crazy and would never work? I mean like some guys don't have airbrushes and paint their AFV's with brushes using acrylics or enamels or whatever.

Please, don't laugh too much!!

Not laughing, but I wouldn't recommend it. One of the major problems is that oil paint tends to be quite translucent, at least at the thickness applicable to modelling. Another problem is the drying times involved, that would be a long process even with a drying aid. Finally, oil paints don't hide brush strokes particularly well. Figure modellers use them in such thin coats, and blend them so thoroughly so you don't really notice. That wouldn't be the case if you wanted to do general painting with them.
Now, oil paints are a wonderful adjunct with other paints. Adam Wilder has a couple great articles over at Missing Lynx describing how he uses them in his weathering process. He uses them more extensively than most.

I wouldn´t think it would be a great idea either!
I use oils for painting figures and on large areas, they dont leave any brush strokes, because of the way I use them. Using a lighter under coat, they are brushed on and then brushed off ... leaving a stain almost, but revealling the lighter under colour on peaks. This is way too much painting for a whole AFV and allthe brush work could break off small detail.
Before i had an airbrush ... the simplest and best method for painting was an aerosol can. Then using humbrols and oils I did the detail work.
If you have sand, olive green and dark grey aerosols, you can paint nearly any colour AFV. Washes and filters will changes the colour to your needs!

I'm with Frank. You at least need a spray can base coat. Then for a simple camo pattern there isn't that much brush work to do. I only use the airbrush when I have to like for a paint not available in a spray can or a complex camo pattern.

The only thing is you have to thin out the paint so it doesn't pick up any brush marks. The gloss and flat coats plus the weathing should help out even out the finish.

Paul