I used regular automotive light green long life coolant on my first home change, three years ago. 2011 1st gen Wee. I believe it had the claims of aluminum friendly and such. I plan to change the coolant this Spring, along with brake fluid again and probably a valve check. The hoses are probably still Ok, but I'll think about replacing them as well.
Next coolant change, I'll use Aisin super long life pink. It's the same stuff as the super long life pink that Toyota has mandated for a while. It replaced the older darker red Toyota long life. Aisin is said to make it for Toyota. I have 2 Scions, so I already have it around. Zerex also makes an "Asian" red long life, but that should be the old spec red stuff. Toyota claims that the SLL pink is 10 year, 120k mile coolant. Yeah and the not so highly regarded Toyota WS ATF is good for the life of the vehicle. Still, I won't necessarily worry about changing it out in only 2 or 3 years. If you look around, you can get the Aisin pre diluted for about $23 a gal, shipped. Cheaper than Toyota branded and also Suzuki's $9-$10 quarts of super blue.