I'd imagine a teaspoon or so of fresh oil on the ground (new engine oil and final drive oil just before the leak became noticeable). There's enough that it sticks dust to the license plate. The oil filter had a thicker o-ring with the K&N filter I took than the one that came with the Fram that went in - everything is snug tho. A drop or two of black oil falls at the aft end of the pipes, but I feel like it's cooking under the heat shields and "all" is largely well.
Engine oil is Rotella Triple-T 15-40, and final drive is, um, cheap GL-5 80w-90.