I bought my new 2016 Sequoia last April and changed the oil at 1k with Mobil 1 0W-20 AFE. I change my oil in all my cars every 5k and I'm almost at 6k. Since this is the second oil change, should I use Idemitsu 0W-20 or stick with Mobil 1 0W-20 AFE? I wonder if I'll get better mileage (13 mpg) if I use Idemitsu. Thanks guys.