Has anyone tried the new Amsoil 10w-60 in their S65? The HTHS of 6.6 is so much higher that I was concerned, I don't know enough to know if this could be a bad thing so I asked their technical email. They told me there is no harm in having such a high HTHS result and they claim it would only improve wear protection and shear stability.
https://www.amsoil.com/p/amsoil-10w-...motor-oil-ets/