Break-in engine oil should be a high-zinc oil.
Use a 5w-30 or 10w-30 motor oil with an engine break-in additive (ZDDP or zinc camshaft additive), especially with flat tappet camshafts.
It's typically conventional-based lubricants containing zinc/phosphorus (ZDDP) and moly anti-wear compounds. ZDDP forms a polar attraction to surfaces in the engine and creates a sacrificial layer.
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