I did a search and discovered several recall for your car. Sone are about stalling and sone about fuel leaks. There is also a bulletin about the valve cover seals. I have attached but pix may not come through. You should take this car to a dealer and go over ALL recalls beaofre you start spending money . Lmk thanks
SOURCE: Kia Technician Times
TITLE: Cam Carrier Sealing
APPLIES TO: Rio
The cam carrier on the Rio engine requires an oil tight seal between it and the cylinder head. This is accomplished with 4 special O-ring seals around the spark plug cavities, and with a sealant on all mating surfaces, while taking care not to allow sealant into oil or coolant passages. The specified sealant is for close fitting machined surfaces, and eliminates the need to re-torque after the sealant settles and cures.
The O-ring seal is available under P/N 0K30E 10 122, and will be added to the next revision of the Rio parts catalog. The sealant to be used when replacing or re-installing the Rio's cam carrier is either Hylomar Anaerobic Adhesive Grade 3000 or an equivalent, such as Permatex Anaerobic Gasket Maker.