I run 5w-30 Cam2 Synthetic Blend. 165k miles. I use that oil because its free from the shop I work at. I also use a Champion PH2808 filter. Replaced the valve cover gasket 5k miles ago. They tend to go bad at about 120k on these 1.6l engines hyundai and kia uses.
Upgrades: Free Flow Filter (WAI), Front Strut Bar, Clear Headlight Mod ||| Replaced:Clutch (kit), Front Left CV Axle, Front Left Wheel Studs, Front and Rear Motor Mounts, Muffler (Twice), Trunk Release Latch and Trim, Interior Driver Door Latch, Crank Sensor
Fuel Pump, Fuel Filter, Catalytic Converter
Power Steering Belt, Battery (Twice), 12v Accessory plug, Front Right Wheel Bearing. 160,000 Mi. Will need another clutch put in soon (Release Bearing Issues).