@T5-T6-Schnappi thanks for the reply. No oil consumption at all. The car is from USA. The car is stock. The car is at ~180k kilometers.

I had the cat inspected by a probe and it's not melted/damaged. I was getting and error P0420 and no others If I remember it correctly. I had o2 sensor check and it was working fine, it graph from it wasn't steady. So we added a spacer on the o2 sensor. It "solved" the P0420 error, but now I'm sometimes getting another error related to the o2 sensor. That it's stuck on lean.

The error code wasn't constant, it sometimes appeared when I did longer trips with harder acceleration on the highway. Same as the stuck lean error.