Gentlemen: What motor oil do you use?

I use 10w-30 for higher mile engines (the stuff that says 75k+ miles). 10w-30 is in the manual for my 64 Dart as being the recommend general purpose oil. I daily drive it, never push it too hard, and it’s proven great. I go with the recommended service interval of 2-months or 4K miles. I did around 4k total miles on the engine over the past year, but time = mileage. I replace the oil filter with the STP oil filter every 2-3 oil changes.

I’ll be running something like 5w-30 soon because I’m about to get my engine rebuilt and it’s gonna get cold, and I’m just debating between the Lucas hot rod (extra zddp) for a few months and then going back to regular 5w-30 or 10w-30.