I will answer briefly because I am still trying to extract the exact internal mechanical engines changes .Here is some more information about it:
I can't help but feel a little bit sorry for MB, the sanctions seem pretty severe, and it was Bosch who built the emissions system under contract, not even MB engineers, from what I can gather.
I also wonder why it only includes up to 2016 Sprinters, don't 2017-2018 have the same engines and emissions systems? @lindenengineering maybe you can answer this one.
.Take into account that the USA hasn't built a modern fuel refinery since 1976 which is pitiful.