My 2017 GLC250d has 45,000kms on it and was due for its second (B) service. I have had some crabbing and mentioned it to the head mechanic at MB Canberra (Austrlia) when I was booking in the car. He was unaware of a fix and undertook to investigate with MB and get back to me. Within an hour or so he came back and thanked me for alerting him to the solution being offered by MB. Said they would need to do a test drive, take some measurements of tyre wear, alignment etc and then have MB approve (or not) the fix.
Just had the service done and they agreed that the knuckle fix was warranted. They have ordered the parts: 2 steering knuckles, 2 front brake cover plates and 2 screws. Booked in to do it in early October when it suits my plans.
Also had them look at the auto stop/start which had not been working for some time. They kept it over night to charge the battery fully to their satisfaction, then agree that it was a fault. The post-service report noted 'found fault code registered within starter battery capacity...... result came back replacing starter battery.' Still working so far.
In terms of tyre wear, I still have the original Pirelli tyres fitted, now with 45,000 kms on them. Tread measurements noted on this 2-year service report are: RH Front 4/3/4, LH Front 4/3/3, RH Rear 3/ 4/4 and LH Rear 5/5/5 (I had a major puncture on this LH Rear wheel around 10,000kms ago and had to replace the tyre so that explains it deeper tread readings).
I've always run 38 PSI all round and had JAX Tyres here in Canberra rotate, balance and align every 12,000 to 15,000 kms. For around $60 a time, it's certainly a good investment! You can see from the readings that the tyre wear is even across each tyre, and even across the three original tyres.
Crabbing aside, which is about to be fixed, couldn't be happier with MB Canberra's support and willingness to listen to reasonable argument.
My tip is be reasonable and friendly when dealing the workshop staff and they will look after you.
And to the folks who don't check their tyre pressures each week (it's easy to do when you fill your tank up), or think that regular balance/alignment/rotation is a waste of money, please reconsider. Your car and wallet will thank you.