The manual requires the oil meets the following spec: ILSAC GF-6A. The advanced fuel economy version meets this spec. I just looked at the truck and suv oil, meets the same spec. Should be fine to use if you want to
You mentioned changing the oil more regularly than what Lexus recommends. Is there any reason or motivation for Lexus to recommend every 10K miles instead of 5K miles? I would think their engineers would know what's best for their car unless there is some ulterior motive of theirs that you have a theory on.
10k mile oil changes are a great selling feature (less maintenance cost), but that’s a long time to run the oil. There are plenty of engine tear down videos on cars that have long oil change intervals on RU-vid if you want to learn more. It’s pretty cheap/easy to do it at 5k mile intervals.
Read Lexus maintenance manual, the 10K mile oil changes are under certain conditions which most won't meet. So most of us need to change oil according to the Lexus book.
