Hello, specifications depend on your particular model. It could be 180, 185 or 220 depending on which model your vehicle is.
I'd suggest a local hands on assessment if you are not sure.
Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops
RepairPal Certified shops can diagnose and repair your 2007 Mercedes-Benz S550. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.