E300D's are simple any filter, Phil sells them or you can use dealer. 606's use a different filter so whatever anyone said about the early engines you can pretty much ignore.

You should be running Mobil 1 0w40, 15w50, or 5w40, or an Amsoil product of similer spec. You can change at FSS spec or sooner, if you run dino you cannot follow FSS.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200