Based on the spray pattern (wet areas) in the photo you may also or only have a Vacuum Pump Gasket leak. Do you have oil spray on the A/C unit too?

Just fixed mine and it cleared up multiple "possible" sources I was thinking had to be fixed. A leak at the vacuum pump gets blown all over. At least on a 603 motor. Is that the motor you have?

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1986 300SDL 440,xxx