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Reply to "What engine oil? Synthetic?"

High zinc - phosphorus  the norm for older flat tappet design engines...I recall an article Jake Raby wrote stating he steered away from actual oil recommendations but he did lean heavily toward Brad Penn within the article.   I use either Shell Rotella diesel oil ( yellow container)  or Brad Penn 30 .....  But always use Brad Penn green oil for breaking in a engine.    Dozens of air cooled motors never went bad with one exception when in my senior moment  I reversed the remote oil filter housing feed and return hoses and the fresh 1915 engine ran nicely for 6.7890 seconds and promptly seized.

Last edited by Alan Merklin
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