What's leaking there are the 8 bolts holding the cover plate. You'll find corrosion below that plate right down to the top of the oil pan.
Remove the cover plate and examine it for corrosion on the back side. You may want to replace it with stainless from Moyer. Clean up the bolt holes (3/8-16 tap) and install studs. Moyer has a kit or just use stainless set screws and JB Weld.
If you're in salt water and are happy with the A4, glycol cooling is highly recommended.
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