Diamond SP III available from any Hyundai/Kia/or Mitsubishi dealership. Any other fluid, even the universal fluids will damage plastic parts in the transmission because of the detergent they use.
What Kind Of Transmission Fluid Goes In A Hyundai Elantra?
It might say on your dipstick, you can also have them look it up at the auto parts store, or any mechanic shop.
