This my 328xi i nought it for my wife as a Christmas gift. And as a project car for myself it has 87k on it and has a couple of issues that i would like to take care of before i get to carried away. It has a grumbling sound and a very slight vibration in the steering wheel almost like a wheel baring and there is a oil smell once in a while. I have heard that they have a tendency to leak from the valve cover gasket or the oil cooler possibly. I have worked on American cars sence i was 13 this is my first bmw. Looking for any ideas or possiblys for the problems