Be sure to know the difference between a tie rod grease fitting and CV axle boot. It's bad if either is torn...but the CV would need immediate attention. The CV boots are the accordion rubber pieces on the inside of the wheel. Googling CV boot might help you know what to look for. They can best be seen by turning the wheel and looking at one side, turning the wheel and looking at the other side.

This is almost definitely not what the kid was talking about but always good to check while you're there.

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1982 300D-T (sold)
1988 300E (sold)
1994 E320 Wagon (sold)
1995 E320
1998 E300D-T
1999 E3204M Wagon
2001 E320
2005 E320 CDI