Engine noise '06 Boxster S

[smcgeary]

I am trying to ask this as a yes or no question (which is hard) so I don't start another oil opinion war. I stopped using Mobil 1 0w40 and started using amsoil european 5w40 (easiest enthusiast synthetic for me to get). So far I like the results and have noticed less noise at startup etc. I have heard that this amsoil formula is not as well regarded as the older 10-40 offering. Living in coastal central CA will I have an issue using 10w40 weight synthetic in 01s in the future??

Thanks!