This needs to be replaced now, as it is a disaster just waiting to happen. That oil will get into every line under the dash and drive you crazy. It can also get into a lot of the Climate control electrical plug connections via some strange drool down paths. The PO of our car let it go way too far and it was all over everywhere.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150