I think you guys are over thinking this. These are low power cars, come on their is no way a 240D could dream of hurting it's axles. Remeber the W126's had 300hp euro enignes thrashing these axles. I have had good luck with rebuilt cv joints. My friend had a set on his Maxima that lasted 50k until he sold it. Now that was a high stress life 200hp V6 driven by a teenager with a lead foot.

Besides they seem to have a lifetime warranty I wouldn't mind getting a new one every few years. Rebuilt ones are fine.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200