Thanks
Jim, thanks. I may go back to synthetic later, but for now do not feel the mineral/dino has anything to do with the noise, which was present all along with Mobile 1 in the engine during the first 1000 miles of my ownership, including before and after the oil tube replacement.
I'm presently running the engine only briefly on 10 mile runs trying to figure out the problem, and hope this is not endangering it.
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