回複：of course i diy, saved all the costs otherwise

Do you believe your maintenance skill has reached the professional level of MB, even though you don't have their SST? If the answer is yes, I would like to say congratulations, since you have the potential to start your second profession after work; If your answer is not really, then I am interested in seeing a comparison between your case and another case in which all maintenance requirements have been fulfilled at a MB dealership, in terms of the overall maintenance costs and car values. Note that running a MB (with which the longevity is a major concern) for 15 years with a strong sign of further running to 16, 17 … is not something that is indeed unusual.