With past cars (123's and 126's) I have only repaired what was needed and have been very pleased with the results. Often only one ball joint is gone and the other continues well. This approach will save you money with two exceptions:

-If you are into an area and in the process you anothe part is hard to get to or requires a lot of work, do that part as well

-Repeated alignments. Around N. Calif the dealers are ripping people by charging $150 for a four-wheel alignment.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)