First, YES, I've read all the different oil threads (and am beginning to be concerned that I seem to enjoy reading oil threads! )

So, I've read, ad infinitum, that, while certain oils (e.g. Delvac 1) can suspend 4% soot, MB cautions against exceeding 2% soot. So a lot of folks reason that we should abide by what MB says, regardless of what a given oil can handle.

My question: what's the logic of the MB recommendation? I mean, if the soot's in suspension, what could possibly be the problem?

I'm fine with going with what MB says....I'd just like to understand the rationale.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife