A few questions about the C3

Hello! Get a C3 in a few days. Hopefully not a bad decision. (truck before Renault, Toyota, Suzuki) Was it with me currently 1st at the price (promotion month) and around the appearance. Quality is certainly the same as with all, because which manufacturer does not build the identical parts of suppliers today. Question 1: Should you change the oil after 1500KM after all? I have heard so often that the oil and the engines are so good. But 30,000 until the 1st inspection is long Because I’m sure that the two years will be more likely. And in the forum I also found a post that told me that the filter would have quite an inlet residue. Which oil does the C3 full synthetic or partial synthetic drive.? Question 2: I would like to buy a car radio at Plus. Simple and inexpensive. Are there any problems. Las in the forum “register radio etc.”, the box is equipped with tens of ECUs. Or it has to be Blaupunkt, Pioneer etc.. Also the Fra ge, are the cables for the speakers pre-loaded, or do I have to lay them even more laboriously afterwards? Do you actually know that cables and sometimes even loudspeakers are available, even if the car is ordered without a radio. Question 3: The on-board computer, how exactly is it with the maintenance. And how do you reset the maintenance key? Do you need a reset device like BWM or can it be done without?