I got both cv boots replaced less than 2 yrs ago but one of them is greasy now. The car is only driven on urban road, no gravel road at all, no sharp turn
, and never turn steering wheel when the car is stand still.
How could it broke prematurely? Could it be improper installation? Could it be cheap part?

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2003 E53 X5 3.0i 80,000+km
2002 W203 c200k 63,000+km
Life's too short, drive Europeans