Just bought a 500 S

I just bought a 500S and i would be thankfull if you could offer any indications and possible problems I should take care of.For the time being almost everything works ok.To be honest I never had an experience with such a big and luxurious car...Small things that I noticed yet are, rear window and sunroof dont work (open and close) as smoothly as the rest, a tool is missing from the toolcase in the trunk..(dont know wich one except the hole is rectangular..) and the reservoir is not closing properly and I had to replace the tap with a plastic from the nearest gas station to make it to home...Please help msince Im new both to mercedes and the forum.. In addition steping on the gas while in N more than 5500rpms makes car burb if you know what I mean..

The Window and suroof sound like one of two problems, the first, both might need a lube job, use lithium grease on the rails and joints of the sunroof and see if that frees it up, same for the windlow. on my C280 there is a rubber plug on the door where the latch is, if your door has this plug you can spray some lube, (window up) and raise a lower it a few times. The best way to lube the window is to take the panel off and lube all the mechanical spots. The second not so good thing is the motors for both good be going, or your battery could be weak, test it without starting the car first, then start car and test it under load.