An update on this - I got rid of the benz on Wednesday. I am really disappointed with the mercedes. It had constant service issues and living in Chicago I got flat tires and cracked wheels because of the potholes. Long story short in the past 2 months I've spent $4500 on the car. Oil changes are $450. So don't get a mercedes!!
Add to that how expensive they are and it's not worth it at all imo. So I traded the benz in for a Nissan Murano (for my wife) AND an Infinity FX35 (for me). Only cost about 10k extra and I got two cars instead of one!!