10 that I can rememeber. One thing to remember. When that bitch breaks you better have a high limit on your credit card. Just cause the car is 10 years old does not mean the parts/service are any cheaper. I can tell you the ignition switch on a new C230 is $1500. Very expensive car to repair when they break, and many parts are only available at the dealer. Something to think about. Good luck!
PS Buy a well maintained one with all the records for sure!