I’ve noticed this too with M1 0W40 vs PPE 5w40. Hell, I’ve even noticed it with non euro spec M1 vs PP. There is a tincy bit more of an engine noise, can I explain it through a scientific lens? No. But I can tell you one thing, I’m not deaf or hard of hearing. You can argue with me saying YOU don’t hear it when you make the swap, well that’s your car and your environment. To each their own.
I don’t think it causes any damage, it’s been discussed here many times over, it’s still a great product at the price point.