ok... just dropped off my Z for 2nd oil change....going mobil1 @4150 miles (I provided the oil) having them look at my slow drop drivers window and my battery seem to charge @ like 15v and almost 16v (does anyone else have this ailment?)...test of my dealership service...hope all goes well!

 

THIS window problem could be the motor mine went at 4500 miles almost 5 months old. The svc dept changed the motor but in the process scratched the door panel and the inside of the door.
Please find a GOOD dealer svc dept.