https://classics.honestjohn.co.uk/askhj/answer/141767/when-did-mercedes-start-using-better-steel-on-their-e-class-

Doesn't even answer the question. I'd be appalled if I'd submitted the query.

Inferred answer is not that generation, so... before and after???

Seems likely the most accurate answer would be "They didn't".

That might not be On Message at Merc, though.