It's hard to make out, I'd be checking the base of the plastic inlet manifold where it meets the block see if any leakage from there, I know these plastic manifolds can easily crack at the screw fixings if over torqued , I've done it myself before. Or could be gasket. There are crankcase breathers but there near the exhaust manifold on side of block, you'll have to do a bit of detective work I think to find the issue.
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