Does anyone know if Audi changed what you get when you order the OEM RS6 oil? Last year when I changed my oil I got Castrol Edge 5W40 Turbo Diesel oil (on left) in person from a local dealer. This year (~8k miles later) I ordered from Genuine Audi parts online since they had much better prices on the control arms I also needed, and they sent me Castrol Edge Professional OE 5W30 (on right). In both cases I ordered by part number. Both oils are specified as VW 505 01.
I went ahead and used the 5W30 since the car's not going to be seeing severe duty any time soon (well, ok, and I didn't look at the new bottles in detail until after I drained the sump.) If this is the new OEM I'm thinking I'll find something else for the next change though, and I probably won't wait 8k miles...