There are much more knowledgeable people on here than me, but I would at first say to not immediately suspect any part without proper investigation. Pull all those plastic covers off and undertray, and have a good look all around the block with a torch. These engines can leak from the valve covers, cam shaft seals, sump tray, some large round seal at the back hidden by the transmission (very common as it rarely gets replaces -trans out job).
If you have patience clean up all the oil you can see, dry everything, then after driving the car next time have a look to see where the oil is coming from before it spreads everywhere.
Only if the oil is freshly leaking out from the oil cooler unit itself would I suspect replacing it. Plastic pipe that often fails is a coolant carrying pipe between oil cooler and block and should have nothing to do with oil.
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