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For pretty much every Merc and BMW I have worked on I lift from the diff in the back and put the jack stands at the jacking points. I've never had an issue with that. If you look at how the diff is mounted on these and most other German cars you're lifting it by the subframe when you do this and the heavy cast diff is just transmitting the load.
For the front I often lift from the center jack point on the cross member and put the stands at the jacking points. If that looks unsuitable for any reason or I'm just lifting a side I use the jack point for the jack and put the stand on the frame rail. I just don't even touch pinch welds on cars unless its with a lift.
If your car is a rust bucket these methods will need to be modified.
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