Nothing. I one year I've done 20000 Km with no problem at all. On the 20 000 Km service they changed oil, oil filter, and dust (pollen) filter.
I'm very pleased with the car. Nothing wrong so far I've had nothing, but nice surprises. Ex: the back wiper starts automatically if you drive back :). The LCD is smart enough to know what door is open and so on.
I tested the car at high speed and it went all the way up to 190Km/h with 3 persons and a full trunk. I guess with only me in the car 200Km/h will be no problem. I snow it's a dream. Handel's better that a 4x4! (with M/S tires). I've order it fully loaded (all options) and it was a very cheap car. It averages 6 l/100km on highway (at 130 km/h) and 7.3 l/100Km in town.
Brakes are a dream. Sometimes I begin to trust them to much...
In my model a on-board computer (average consumption, km left to drive...) was not a option and I'm missing that, but the cruse control, ESP, AAC and all the cool things are a dream, especially for the money!
190 KM/H with 3 people in is not that good I got 199 KM/H with 4 people in my 1.6i 16v Renault Scenic.