2021 Seltos owners manual for the 2.0L engine allows 5W20 , 5W30 & 10W30 oil choices . I went with Mobil 1 5W30 for the Georgia summer along with a Fram Tough Guard oil filter (good for 15,000 miles) . The oil drain plug requires a 17mm socket and the openings in the skid plate for the oil drain plug and oil filter access makes it a very easy operation for the DIY'er who is equipped to do oil changes . I will run the above combination for 5,000 miles / 6 months (which ever comes first) . The Kia 2.0L engine appears to be very easy on oil and runs smooth ! *Interesting to note that the 2022 Seltos owners manual recommends only 0W20 for the 2.0L engine for all seasons .