DieselPaul...FWIW I ran your questions by my oil analysis tech. His reply, in part: "No worries on after treatment devices as this product is CJ4 spec which identifies that it has a non-metallic ash content and therefore is designed for EGR and SCR systems. It is true that pre-CJ4 oils contained higher levels of zinc and phosphorus which will poison a catalyst, but even then it may last nearly the lifetime of the vehicle."

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife