but they must use proper abarth parts and the correct oil 
Or parts of a similar quality, all written down on page 13 of the warranty/service booklet. Owners of the launch editions may have the earlier service book although the only real difference is pollen filter changes iirc. The details may be on a different page number but will be under the section of how to maintain the warranty.
I have re-titled this thread as a lot of owners will now becoming up on their service and it helps to have a single point of reference.