Hello together, my better half needs a change of oil for their mini shortly. As part of the inspection at our local VW Heini this is to be done. Now they advised us to bring their own oil for cost reasons. But what oil does the mini like now? And how much does he need of it? Have read in the search from 0W40 to XW30 or Longlife-1 / 4 but can not really make a rhyme out of it. In advance thank you very much!