THE BEST SIDE OF MOBILE MECHANIC FOR MERCEDES BENZ

Is this affordable for this type of young vehicle or should I merely use a fuel additive? I will travel only about 5k on a yearly basis, with many shorter journeys but will Have got a 50 mile Every single way motorway run at least when per month, with other lengthier journeys interspersed so I'm fairly delighted that the engine can do passive regen