My wife recently bought a 2022 Kia Seltos with the Kia Nu 2.0L non - GDI / non - turbo MPI 4 cylinder engine . The Kia Owners manual states 5W20 , 5W30 and 10W30 are suitable (depending on ambient temps expected during the OCI and whether or not you are towing , driving in mountains , etc.) ... *So if 5W20 is listed as a suitable oil grade - then why not 0W20 for this engine ? The ONLY reason I can think of is most 0Wxx oils are synthetic and Kia marketing is trying to keep the cost of ownership down by not recommending 0W20 as being suitable ? If there is a valid reason why a 0W20 can not be used in this engine then I would like to know ? I use 0W20 M1 EP in my daughters 2020 Corolla1.8L MPI , non - turbo 4 cylinder engine (0W20 Toyota recommended oil weight) and would like to buy the 0W20 M1 EP for both Kia and Toyota vehicles .