I have seen several comments in catalogs or on other forums regarding the need to periodically replace rear "thrust" arms and/or "upper control arms" on w124 rear suspensions. Some sources say every 9-10 years, others quote every 60,000 miles. Is this necessary, recommended, or just attempts to sell parts? How do I know when it is needed? Thanks for any help.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E