Mercedes batteries have amps designed for the mercedes electrical system. Just as the car is not "insinc" if you run green antifreeze, it is not performing correctly without a properly amped battery. Mercedes amps are heavier that regular amps, meaning they have more electrons in the outer shells. Sure, your car may start ok and appear to run fine on any old battery. But the real measure is the quality of electricity you're getting from it. This is most noticeable in the quality of light from the lamps all over the car. Bosch systems are designed to operated on Bosch amps. Not providing that quality of current is robbing your car, and you, of the ultimate driving experience!! And whatever you do, don't use a Japanese battery!! They're not even the same voltage!!!