Not by me. 10-30 or 10-40 depending on what time of year. Zinc is not needed in a Model A engine.
My father ran "drain oil" in his coupe..he would buy it for a penny a quart, oil drained out of the cars the local gas station serviced..
Thats nice,you doubt a story told to me by my father..take a minute,think about that..
Thats nice,you doubt a story told to me by my father..take a minute,think about that..
I just think he was buying reclaimed oil (drain oil that is re-refined) and called it what he did. Think about it. Why change oil if you are just putting dirty oil back in?
My builder recommended Valvoline Racing oil 20W-50.My engine rebuilder recommended Valvoline VR-1 high zinc racing oil, 10W-30. Given what I spent on the rebuild, I follow his recommendations.