Join Date: Jan 2017
Vehicle: '02 SLK32 AMG
Other Toys: '05 SL65 AMG, '98 E320 4Matic Estate
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I don't know if you've gotten to the bottom of this yet, however, I do have some input to offer that may help you.
This week, due to the frigid temperatures, my SLK32 developed an oil leak in that general area, and I was able to trace the source. Mine is leaking from in between the oil filter housing and the attached oil cooler, there are 2 o-ring seals there. The leak also made a mess of my engine and trashed my serpentine belt, so I am replacing it as well. It's not uncommon for these same seals to leak on other Mercedes engines apparently. I plan on doing a full DIY when my seals come in off of order, but I'll list the Mercedes part numbers for you:
1121840261- Larger Oil Cooler Gasket
3892670080- Smaller Oil Cooler Gasket (Note: This is an updated version of the gasket, old part number was 1121840361)
1129970092- Serpentine Belt
One important thing to note as well- you will want to use the OEM MB gaskets, they have more 'meat' on them than any of the aftermarket ones, by many other's accounts.
I forgot to add as well- if it's leaking from the bottom of the housing and not the oil cooler, there is another seal there as well:
1121840061- Oil Filter Housing to Timing Cover Gasket