221 V8 Engine Oil Recommendation

[Coneross-A]

Sorry I've taken so long to get back to responding on this post. Some other pressing issues came up and I haven't had much spare time. I'd like to thank everyone for your responses. For now I am using Rotella 15-W40. It's a little thinner than the straight 40 I run in my A, but it will hopefully help clean up the engine a little before I put straight weight in.