Hyundai's own oil company product (Xteer SP4) SDS looks to be group III ??: "Distillates (petroleum), hydrotreated heavy paraffinic" - CAS 64742-54-7 - 80-90% content http://divisacolombia.com/pdf/particular/msds/XTeer%20ATF%20SP%204.pdfhttp://www.xteer.co.kr/eng/sub2_6?prod_id=PRODUCT71
You might say "but that's for SP4, not SP4- M". Except for the U.S. marketed Hyundai and Kia fluids, NONE of the Hyundai approved fluids have changed their designation from SP4 to SP4- M (Michang, SK Zic, etc.). Here's an example of SK Zic which claims to be the factory used product: http://zic-eu.com/products/transmission-oils/zic-atf-sp-4.html
Here's another Korean made product NOT on Hyundai's approval list. It, too, appears to be a group III oil in the SDS: http://www.korlube.com/en/product/product_view.php?ca_name=ATF+%26+Gear+Lubricants&wr_id=37
The Mopar SP4-M sds does not list a CAS No. and just states "petroleum base oil": http://www.weirparts.com/msds/Chrysler2016/MoparSP-IVMAutomaticTransmissionFluid.pdf
Mania, if your statement about SP4-M is correct about it being a group IV or V base oil, then it seems that ALL of the rest of the approved products are different (group III). I'm not calling you a liar, but this situation makes no sense to me at all.