This is interesting. The smell (and I assume oil leaks) started a few weeks after I did my last oil change in Nov which coincidentally is the first time I've ever used full synthetic oil in it. We've all heard about issues with synthetic oil causing leaks, but I read those were debunked. Looking now, those busted myths seem to be on the oil manufacturer's sites.
Or perhaps I got a mislabeled jug with the wrong weight oil. It's awfully coincidental for both valve covers to be leaking that much and me to have not noticed it before.
I think I'll clean off the leaks and put some dino oil in and see what happens. It's still showing nearly 100% full since Nov. so not much has actually leaked out.
I know I'll be judged harshly, but I used Walmart brand high mileage full synthetic:
https://www.walmart.com/ip/Super-Tec...t-Dx/764492025