Dexos2 got effectively split into R for gasoline engines and D for diesel in the last update. Corvette and Camaro oil was dexos2 and became R overnight. Manuals went from dexos2 to R in the next print.
From GM / Mobil page:
This has all been covered at length in many places.
Again, note that dexos2 was already Euro oil (it is based on ACEA C3). GM now states:
So, as you now see, since dexosR is a variant Euro spec off C3 just like BMW LL-04 or similar, and GM themselves say it is both superior and backward compatible with dexos1 G2/3, GM has answered your question and told you exactly what I said. Euro oil is better and even for a Cruze that specified dexos1 Gen 2.