Well, sometimes the sunroof will 'stick.' When I press the button to go from "closed" to "vent," it opens to a few cm, then gets stuck. In order for it to go up, I have to nudge it a little while holding the button. Is there something I should oil, loosen, or tighten?

 

Mine sticks after the sunroof gets wet. I think the water and the rubber weatherstrip create a suction and thats why its hard to open.

 

You could try spraying the seals with silicon spray (the stuff used to lubricate sliding doors)

 

Buy some silicone grease in the plumbing section of your local hardware store. Massage it in to the rubber weatherstripping and wipe off the excess. Do not use regular grease - it will attack the rubber.

While your at it - do all your weatherstripping.