I have a 2014 Kia Rio with a 6 speed auto. It asks for SP-IV specification transmission fluid.
The transmission shop I am considering for a fluid change service, said that they use an all purpose Dexon6 fluid. They said they then add in a special friction modifier, which will then augment that fluid to meet different manufacturer specs.
So they take the base fluid and add in the ford spec friction modifier for a for trans, and add in a kia spec friction modifier for a kia.
Is this normal in the automotive service industry. Is this acceptable? Is this approved practice by OEMS?