Gebo,
I just bought a 2017 Lexus GS 350 with pretty much the same engine. I decided to use the new Mobil 1 Annual Protection as I feel its low-calcium additive package is a better fit for Direct Injection engines, as Direct Injection engines can be susceptible to Low-Speed Pre-Ignition (LSPI). Oils with high calcium levels (like the Amsoil Signature series) could aggravate LSPI. Amsoil is in the process of re-formulating its Signature Series oil for this and other reasons, but Mobil has already been taking this approach for a few years now.