That is shocking.
It's bonkers isn't it. Let is know how you get on, and good luck!I have a 2018 GLC 300, 56k, with engine light on. Bought it used a year ago. 1st place diagnostic indicated faulty fuel injectors, replacement $4500. Got a 2nd opinion and they indicated it was a cylinder issue and recommended taking head off to take a deeper dive. Discovered piston crack in cylinder 4. $6500 to replace. I am now taking it to dealer to plead for mercy and try to get a deal. Will never buy a Mercedes product again given how new this car is and the care the 1st owner gave the car. Should not have a cracked piston after 4 years, 56k miles!