Look at the cowling on the Jug. Looks like something might have gone through the top of it. Be it a rod, round, etc.
Here's a few pics I snapped this morning for an oil leak reference.
I think HT is on the right track. Oil is going to streak, not blotch. However, I think at altitude the oil would be less dark as it should be somewhat fresh and hadn't been in contact with dirt yet, and the streaks should be more narrow. Not sure how/if it would streak on the back of the canopy. I couldn't find anything this morning that had streaks all the way to the empannage.
My .02...more narrow and less opaque.