Low mileage Hundai Kona 5w-20 or 5w-30?

Go here for tranny issues . https://www.kiasoulforums.com/threads/transmission-toast-at-13-400-miles.118819/ . A shame having so many issues . Would likely have a '20 or '21 SOUL by now .
I'm about to turn 40K on my 2020, and can't say I've had any issues. Had the firmware update performed at about 33K. A CVT just isn't going to do some of the things a conventional auto trans will do (you can't flog it from a dead stop, for instance -- it'll most likely slip -- I wouldn't want to try it). Hopefully Kia gets this issue corrected in time to prevent a class action suit from unhappy owners.
 
I use 5w-30 in all my Hyundai's. The current 1.6T, the 1.8 I had in the Elantra, the 2.4L in my Tucson, and the 2.0L in the wife's prior GT. The engines just seem to 'like' it better, I cant explain beyond that.
 
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