Could be anything, if you're having trouble locating it the best bet would be to give the area a good degrease and wipe down then take it for a bit of a spin then have another look.
If it's above the manifold, rocker cover gasket would be the obvious thing to check.
If it's below the manifold, check your oil filter is hand tight, turbo oil feed, dipstick. Could also be head gasket.
Please bear in mind that I'm not suggesting that any of these are ultimately the issue, but giving you an idea of things to check.
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