If that is an OE part, I'd be fussing at dealer and MBUSA. That sort of failure is totally unacceptable. MB has done recalls for failing control arms in the past (R107 for instance). How does the other side look?

I would never use an aftermarket control arm. I'd take a used OE control arm over aftermarket.

Have you searched online to see if this type of failure is typical for your model car?

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

I have seen a few dozen or so pictures on the internet about W210 control arms breaking right at this spot.

I think one should have a cleaning interval for the control arm cavity too, salty mist can get into the arm from the spring hole. A good dousing with body cavity wax inside the arm may help here.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

There apparently never was a recall as such for the 107s, but there was an agreement to repair subframe 107s delivered to USA (and Canada).

If that is what you are referring to, it seems it was for the control arm subframe mount, not the control arm itself.

At this stage, without large numbers of control arm failures, MB would not likely issue a recall unless forced to.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

W210 spring perches........control arm failures.......what's next? Geeesh!

Both these item/areas could have been constructed with air-frame style machined aluminum, right?

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'06 E320 CDI
'17 Corvette Stingray Vert