I was using the Valvoline maxlife in my 2.7l Tacoma and was getting some serious noise out of my PS pump during really cold mornings, the maxlife is a very thin DEX VI type ATF although being fully synthetic, the Valvoline dex/merc is a Dino DEX 3 atf and is slightly thicker viscosity which is specified by Toyota for the PS system, I think maxlife would be fine if you live in warmer climates, I have yet to hear the noisey pump as before since going to dex/merc type, yet2019 Toyota 4Runner
Sucked out the PS reservoir. Refilled with Valvoline Maxlife ATF.
I do this every oil change. Recycle the old fluid with the old oil.