Does the chassis like tie rods, ball joints , etc require regular greasing? or are they sealed?

Generally, the factory parts are sealed. Some aftermarket parts are greasable. Look for zerk fittings on those parts if you're unsure.

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One Big Ass Mistake America

If you have grease fittings I would grease them like once a month.. I don't think it would require anything more than that.

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2009 Pontiac G8 GT- Roto-Fab Intake, Roto-Fab Radiator cover, Superchips Cortex Tune, Tinted Tail lights, Corsa Cat-Back Exhaust, Tinted side markers, Painted GXP Diffuser, Tinted Reflectors, Painted Grilles.

They recommend to do 'em at each oil change...which would be a month or two.

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One Big Ass Mistake America

I have greasable endlinks and trailing arms, but those are aftermarket parts. I don't think anything on the car from the factory is greasable. I try to grease them whenever I have the wheels off, but in reality it's probably something like 5 times a year that I actually remember to do it.