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Could also be the valve cover gasket. You can try (carefully) to tighten the bolts a little; when was the last time the gasket was replaced? Does it feel soft and rubbery or hard and plastic-like?
In addition to blow-by (and the valve cover has an oil separator built in to minimize that) there is also oil in the intake from the turbocharger.
How much engine oil do you add between changes? Was the oil down significantly after this recent trip?
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
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