Whatever oil MB specs for it, their is a sheet kicking around on this site somewhere.

Personaly I like Mobil 1 0w40, Delvac 1 5w40, and various Elf or Amsoil products seem to work well.

Don't go to heavy on an M119 or you will blow the oil tubes in the head and have some nice lifter tick.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200