Hi all, i need an advise. I got a 2 years old Spectra5. The "check" light appeared lately. I went to Kia SC and the foreman reset it through computer system. And i was charged for rm65. According to the foreman the "check" light appeared is due to Shell RON95 petrol which is not suitable to use for Kia Spectra5. Is that true?

And lately my FC is increasing like hell. RM60 Petrol for appx. 250km only. Will it be the O2/Oxygen Sensor spoiled? But the "check" light does not appear. What will be the other possibility which caused this? Need your advise. Thanks in advance man...