REfacing the rotors is recommended by MB & almost all dealerd do reface rotors every day. WHEN finished there should be at least 1mm above min spec. MANY race car people use rotors that have "heat" cycled on street cars & reface them to race with. WHO ever says refacing rotors ins't recommended doesn't work at a BENZ retail outlet center.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator