With the 3 and Y is about all 4 an air filter exchange provided. You can do this yourself. Check the brake fluid yourself. On eBay I find three different replacement filters: a) same as the original filter with white filter, b) similar Original filter with one side in blue with activated carbon, c) one side with white filter and the other side is black with activated carbon cassettes. Have you already had experience with this with activated carbon an advantage? Chwarzen activated carbon cassettes is the normal filter layer even thinner and it filters less dust / pollen / etc. If smells, you should use a cleaning agent in case of removed filters. To get mold etc. out of the system. Can someone recommend something there? Brake fluid testers are on sale and you simply take the highest class 4+ as a replacement if it becomes necessary. Which wiper blades did you use? I saw in the advertisement Bosch, the same as for the Pa ssat. I have brake blocks cleaned and protected against corrosion every 2 years when changing tyres (winter to summer).