I'll scan and post the relevant pages from the "Introduction into service" manual for the 1995 E300D. I'm not proficient in the technology and have just accepted what MB says. I don't think it changes the sound of the engine, which is mostly drowned out by the sound of the IP anyway. I would appreciate the opportunity to read your analysis.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970