I just knew got additives for ATF.
looks very tempting.
Can sifus here comments, what if I use this oil on a Hyundai Atos?

Yes I know its not a hi performance car, but I just want better shifting of my AT tranny.

It's 10 year old Atos, my tranny still good cond, only when cold/many ppl inside, can feel it work extra (rough) on low gear shifting.

now im using OEM hyundai ATF, with 20K interval.

Should I changed to better ATF? or stick with it, but add Lubeguard?