Could be so many possibilities ... where to start.
You really need to clean the engine bay well get all oil staining off and watch like a hawk.
Question that first comes to mind is, is it engine oil? If the drip is directly from above, then it most likely isn't engine oil and more likely power steering fluid.
Learn to differentiate oils.
Engine oil will be black .. as in sooty inky black as black. Trans fluid(if auto) is dark red, fresh will be more translucent red. power steering is same/similar to trans.
And don't assume that just because it's dripping there that the leak is from directly above .. oil leaks can 'travel' along a line before they fall to earth.
This is why you need to give it a good pressure clean and degrease and then watch where the fresh leak starts to come from.
But! .. assuming it is from directly above the oil stain spot, about the only oily components directly above that location could be power steering reservoir(and hose to and from) to pump .. or auto trans joint at the trans cooler, also the trans temp sensor .. if it's an auto.
If manual, I dunno about any possible transmission cooler gear on that side.
Also note that it if is actually engine oil(the black as black stuff) it could have built up in the intercooler and hoses(happens!) and then oozing out of the lower hose, if the clamp is a tad loose.
Mine did this a few years back. Pulled I/C out cleaned out hoses(small pools of it in hoses) threw in petrol and brake cleaner into I/C sloshed around hosed out, more brake cleaner(primarily to help disperse water and more cleaning, blew out with air back into car and no build up for quite a while. Mine didn't have that drip tho, it just oiled up the chassis area heaps and looked ugly as, and hands got mucky for no reason if I was working in that area too.
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
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