Shertex, you don't say what brand, etc., of oil you are using. Clearly, that matters, whether you use a synthetic or non-synthetic. Diesel-rated oils are capable of absorbing soot, the amount varying between brands and types. In addition to the miles on the oil, you need to consider the length of time the oil is in the engine and the amount and type of use that the car gets. Anyone attempting to push oil beyond the factory recommendations might be wise to have the oil analyzed at the mid-point.

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