yes, I posted a thread on that in the diesel section with pics. Happened to me once. I think it was a Hengst filter on my w123.

No other episode since.
Someone gave a plausible reason.

Denis

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD