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Some oils are just noisier than others. I don't have an SAE subscription anymore, but there was at least one research paper written about how the acoustics of an oil were not directly correlated to its performance in an engine.
In other words, for the proper oil viscosity, extra noise in brand A over brand B doesn't mean that oil is working any worse (or better).
If you sleep better at night with the quieter engine on BMW (SOPUS) oil, then go that route.
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Now: 2017 Corvette Grand Sport, 2001 BMW Spec E46 race car, 2025 BMW M2
Past: 2011.5 M3 sedan ZCP
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