That "higher synthetic" is Pennzoil UltraI use Pennzoil dyno oil on my other cars. Or Pennzoil Platinum (synthetic). They have a higher synthetic that just came out and I want to try that out as well. I also use Mobil 1 on the 2008 RX400h and xB my mom and brother have.
Pennzoil Ultra, 10w-30 - It's hot in AZ
In my wife's ES I use Platinum and in the Truck I use Pennzoil Dino.