Quote from a post above
I have used this service, but this service is by no means free!! and no one should expect it to be either. My experiance was because I thought it was free...lol.
My experience:
Changing a tire, giving you a battery jump, install a battery (at reasonable price) or delivering a gallon of gas is free, Lifetime weather you own, lease or borrow the car, stolen does not count, because they ask you the name and VIN!
No other manufacturer provides the service, BMW, Lexus, VW, only during warranty, and some others (Most American) will only send out a truck to tow you back, or sell you a battery. A few dealers provide the service on their own.
During and after warranty they will do small items if they can, belt, hose, fuse, after warranty they will charge, and they are trained Mercedes mechanics. I think Rolls-Royce was the only one that offered similar service