If your pan plug is worn, leaking or rounded off, dont fight it anymore! Buy a new pan plug and copper sealing ring and stop those unsightly oil drips now. This is the small 13 mm head factory pan drain bolt that came on 240D, 300D, 300CD, 300TD and 300SD from 1974 to 1985
Replace when leaking or starting to round out.
616 617 Diesel Engine Oil Pan Bolt ( Nut ) Drain Plug and washer