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#10 |
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,251
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I use 20-50, and do not add anything to it. New oils have some zink in them, just not as much as several years ago. Original Model A oils had none. The A has a forged steel cam, as opposed to cast like in modern engines. Also the A has very mild valve spring pressure, so added zink is not needed.
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