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Congratulations. The 240 is a good car. I would not go crazy on adding parts to the car as they only lower the value. European cars tend to retain their value pretty well compared to other makes, especially if they are completely stock. If you do decide on modifications, i would suggest brabus rims and bodykit. Those are specialized parts made by official dealers, they will cost more but are definately worth it.

Carlsson is also a good aftermarket brand that caters to the mercedes brand, look up their website to get an idea.

As far as the interior, there really isn't much else you can do that would make the car better.

i had a c240 and i loved it! anyway yes use premium gas, and another thing i cannot stress enough is when anything goes wrong take it to a MERCEDES dealership. Not a Mercedes repair shop, no, a MERCEDES dealer. either way your going to end up taking it to one, it might cost a little more but that goes along with owning a Mercedes-Benz. also try to keep it as stock as possible *cough* radio *cough* i almost bought a used Mercedes, before i realized i liked the new (2002) c240 more, and i didn't get it because it had a Sony radio in it, major turn off. so try to keep the car stock. enjoy driving.

yeh premium gas on all mercedes for the most part. I haven't found much to do to my c230 kompressor. I did some cosmetic things. carbon fiber shift stick and pedals, wood dash trim. some pinstriping down the side, i replaced the seats with some heated massaging ones i got off a Beemer at the junkyard. some mercedes floor mats and some white walled tires. I'd reccomend things like this as performance parts are hard to come bye for mercedes like mine and yours i'm pretty sure