My BMW Z3, 6 C, with 54,000 miles had never been serviced, Oil changes yes. Amber took it from that, changed all fluids, changed plugs and added special software upgraded for the 1997 Z3. This car was fast to start with, but now I have 5 to 10% more power. I left rubber on a turn from 1st to 2nd gear, never had this much power. Amber knows her cars, very friendly and I recommend for all BMW owners