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Detergent oil cleans the cylinder walls, and make it a little slipperier (is that a word?), so sometimes the rings don't seat.
Obviously, the heat cycling and proper loading is the most important aspect of break-in, but oil choices can be critical also.
Ask most old VW guys, and they'll tell you to use non-detergent oil during the first 500-1000 miles.
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2023 Ford F-150 Platinum 5.0 Coyote FX4
2019 Toyota Sienna XLE AWD
Metal Building Erector, Recovering Porsche Guy
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