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Non synthetic is better for older engines, if you can find it.
Not cheap.
https://www.amazon.com/Castrol-Class...52&sr=8-6&th=1
Here's a good article about zinc content in engine oil.
https://autosolutionlab.com/high-zin...-brands/#Triax
Still more reading about zinc content:
https://bobistheoilguy.com/forums/th...r-2020.331223/