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After siphoning the oil, it would be safer to replace the pan.
A W123 oil pan is cheap when purchased new under Febi brand (MB sells them for $80+). Make sure you get a new gasket if the drain plug proves too difficult to remove and oil pan replacement is necessary. Clean ALL the allen bolt heads that fasten the pan to the engine before removing them or you risk stripping them as well.
Make sure you also wrap the metal transmission cooler lines with some sort of rubber before fastening them back to the oil pan during reinstallation.
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