actually, not necessarily. I've replace torn (I mean really torn; no lube left inside) and were binding so bad, I couldn't turn left after a long drive with them almost binding completely...... Re-packed, installed original boot (not torn; clamp seal gone) on both sides (inner CVs; both) and that was in Jan..... No issues since. Re-packed torn outter CV boots several times (the outter tear more frequentll than inner CVs); no issues...... I will probably get my half-shafts rebuilt soon, but no issues after several re-packs of torn CV boots..... If the outter CV joints start to bind and clunk, then they're gone and need to be repalced, but if you catch them before, you shoudl be ok.
2009 335i Xdrive
Factory M-sport package
BMW Individual Audio
Pretty much every able factory upgrade by previous (1st) owner.
Performance upgrades thread startied