As per MB USA:
Vehicles with Flexible Service System FSS or FSS+ starting MY1998 can use 229.5, 229.51 or 229.3 oils.

As per Mobil 1 website:
Mobil 1 0W-40 meets key industry and car builder specifications for Mercedes MB 229.5

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ARVY

1999 E430
1999 C230 Kompressor
1992 300E (write-off)
1984 190D 2.2 (sold)