Just came across these forums hoping for some advice.
My BMW has developed a lock problem whereby the key simply does not turn / work the locks very easily. (Yes this is a manual key with no remote)
I tried spraying some oil inside both passenger and driver side locks, and this worked to a degree, but now its deteriorated to the point where it is very difficult to open/close the doors.
Any ideas what I can do or how expensive this might be to get fixed?