The tune up is replacement of plugs and filters only. There are no setting that require adjustment or special tools needed. The US market does not get the 520 so I am unsure of how to guide you in the replacement of the spark plugs etc. This is also assuming you have basic automotive skills, if not or if this is unfamiliar ground, I recommend getting a repair manual. I have several editions of Robert Bentley publications for BMW repair and I recommend them highly. As to the donation, the home page has a window you can click to make a donation, thanks.