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When I changed the head of my former '87 300D Turbo, I bought a new timing chain tensioner as a matter of safety and thoroughness. However the new tensioner (and I don't remember the source) leaked—apparently someone drilled a hole too deep. I returned it and put the original back.
You might see if the crush washer is available as a separate part. Shouldn't be too expensive and that's the only place it might leak if, as Manny notes, it's not actually a valve cover or head gasket leak that looks like a tensioner leak.
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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