The oil could be comoing out of the hose in the picture. The clamp on the hose is not in the proper position on the hose. There are two white lines on the hose that the clamp needs to be lined up between. Loosen the clanp and move it to the proper location and retighten and clean the area then recheck for leak. I bet the leak will stop.

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Mercedes Benz Master Tech - Retired