Since MB229.6 is HTHS of just 3,0 mPа*s I'd prefer MB229.5. If you're leaning towards Ravenol I'd suggest going for
RSP 5W-30. IMO after warranty you're also fine running MB229.51, which REP 5W-40 and RUP 5W-40 come with, as
current DI-turbos tend to run fine with C3-like mid-SAPS oils. This should result in reduced IVD built-up. Plenty of
excellent UOAs on European forums.
https://bevo.mercedes-benz.com/bevolisten/229.51_en.html
RSP 5W-30. IMO after warranty you're also fine running MB229.51, which REP 5W-40 and RUP 5W-40 come with, as
current DI-turbos tend to run fine with C3-like mid-SAPS oils. This should result in reduced IVD built-up. Plenty of
excellent UOAs on European forums.
https://bevo.mercedes-benz.com/bevolisten/229.51_en.html