What you are basically looking/at is the "oil degradation" factor and "distance to next oil change". These are read/reported by programs like
MultiECUScan. The same data will be available to professional equipment from the likes of Snap-On and other kit, plus of course Fiat dealer kit.
Because there is no absolute quality measurement then all one can absolutely rely on is having an oil change AND having the oil change flag reset at the same time.
What annoys me about this diesel oil change flag reset is that it appears that even some Fiat dealers are failing to a) do it and b) understand why and how to do it. Many just focus and home in the on "Service" computer and are totally unaware of the separate and independent oil service/change for Fiat's modern diesel engines.
You could all really get me very angry over this. I've owned privately and worked on my own Fiats for 41+ years. I have not had any manufacturer's training but do always try to purchase official workshop manuals etc. and fully understand any Fiat car I have. This means I see and understand a limited range of Fiat cars BUT BUT BUT I expect every and every Fiat dealership and their technicians to be well educated in the requirements etc of the models. Even if they have no personal model experience then a pucker Fiat dealership will/should have all the relevant technical information, service, etc data to hand. So when I see/hear of Fiat cars going into a dealership for service/etc and coming out not appropriately catered for I get very very angry. Makes my blood boil!!!!
If you are a recipient of dubious/poor Fiat dealer service (be that sales, parts or service) PLEASE PLEASE tackle the dealer firmly and politely and if you are not IMMEDIATELY satisfied go straight to Fiat UK and raise merry hell. Do not walk away and do press for your rights for quality service, competence etc. from a Fiat UK dealership.
The more we complain about poor/etc service the more likely we are going to get a far better UK wide Fiat/Alfa dealership quality support.
Finally....please don't get me wrong. There are excellent Fiat dealerships out there and they deserve our support. Occasionally even the best will initially let us down but will hopefully respond to eradicate their initial failure and go one or two steps better. At the same time they will hopefully make sure that similar problems/issues do not arise again.
Sadly there are other dealership who's service and aftercare service performance is well below what my rabbits could achieve and these dealerships need to be brought swiftly to Fiat UK notice.
I've not spent 41+ years of buying Fiat cars, supporting them in various owner's clubs etc., to allow ANY dealership to damage customer service, respect and of course the FIAT brand.