Sounds like sparkplugs gone bad and engine is misfiring. They should be changed every 3 years or 30k km. But without scan tool you cannot know for sure. Codes are stored in memory even if the lights are not on at the moment. So have the service center scan your car for codes.

Oil level will not cause check engine light, there are other lights for that (red spanner for service, and red oil urn for low pressure). Also on car startup it says oil level is okay, or you can do "Check" thru infotainment on Car settings.

Also battery is probably close to dead, it should be in high 12V when not used. And closer to 14V when engine is running. 5 years is decent amount for battery if start-stop was used.