Hi all! I bought my Z4 last June, the car has 80.000km on the clock so it is quite acceptable that there will be some squeaking noises dew to usage.I have treated all the car's annoying sounds but one.This sound is coming from the driver's seat from the connection point of the bottom half of the seat and the back half of the seat. From my understanding it is a plastic/leather sound.Is there any way to treat that? I bought some liquid leather products to soften the seat leather and i hope that this will do the trick. Any suggestion is welcome! Thanks!