This is one of those things that has been discussed manyt imes before.
Some mechanics say don't change it, some say do it.
Its a tough call. I would suggest you make sure the mechanic is a mercedes specialist. I don't take my car to any mechanic other than my mercedes independent, who only works on mercedes and has done so for 30 + years.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.