Thank you very much for the answers from the three experts. I changed the oil a few days ago, so it's not an oil problem. The issue now is that the RPM is high when in automatic mode, and stepping on the accelerator doesn't increase speed. There's always the sound of revving, but I can't just floor it. I have to switch to manual. In manual mode, the gear displayed on the center console is too low. When driving at 90 km/h on the highway, sometimes it's in fourth gear, sometimes in fifth. On my way to work, there aren't any steep inclines or declines, so I can't keep switching between automatic and manual. I'm busy with work and can't stop driving. Sigh...

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