Error code 9C53 keeps coming back after reset. Last time I reseted it one month ago. Code refers to Auxiliary heater. No issues with the car so far, cabin temperature is okay and coolant temp rises slowly but steady to about 84 C

Cool, thanks for tips! Hõbenool sounds like good option. If I change oils I want that it will be done using the flushing method. Do you know if they use BMW "original" oils by default or not?

I'm looking for recommendations for companies that are specialized in or do good work related to automatic transmission gearbox oil changes near Tallinn. I have E91LCI 320da with its original ZF 6HP gearbox. All recommendations are welcome!