Hi. I'm thinking of buying a used 2005 C240 2.6L. Been working on my two Volkswagens for many years now. I believe the two most important tools are the factory service/repair manual and the software tool that interfaces with the various computers in the car (ECU, ABS, Comfort Control, etc). Is there one we can buy that's more than just a standard OBD II reader? One that's specific to Mercedes (C240) that lets us go deep?