Originally Posted by dieseldiehard

"I think they do it until the warranty runs out" - what is this in response to, lietuviai? Not roadside assistance, that is perpetual, as long as it looks like a Merc and has a MB VIN# the dealers operate a roadside assistance service vehicle, it can be as simple as providing a little fuel if you run out or a jumpstart if your battery is dead. Of course if it's anything else they will call a tow to carry the car back to the dealer, where it is held captive.
The warranty does not figure into whether or not the trap oxidizer is replaced or not.