I was going to leave it stock...

CFD244 said

Has anyone used Shell Rotella T 15 w 40. I know it's a diesel application, but I wonder if it has the "good stuff" that used to be in oil years ago. I us it in my Kubota, Cummins, and Mercedes but haven't researched if for gas engines

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I don't trust it enough for break in, and I'm a little skeptical of it after break in too. I think the levels are too low, so now I use VR1 oil. It's a little more expensive, but I've got one flat tappet with close to 20k miles with no issues using VR1.