It looks too clean to be engine oil. Check your diff gear oil level. You do have brand new oil if you just changed opg so it could be just brand new oil.

When my m54 got this oilily was due to a bad o-ring on the oil filter cap so start there and work down. You should be able to wipe most of the areas clean with some brake clean and do a test drive and look for new oil. You can add some florescent oil dye to help. I bought some gm branded stuff to track down my oil leak recently

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)