Comrades,

I am in the market to replace to rear tires. I prefer buying used ones on Ebay. I have been informed due the vehicle being 4x4 I have to have replaced all 4 tires. Unless, the use timing on the tires are below certain requirement.
Can any one further elaborate on the statement?

I have 2006 X5 4.8is.

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2006 4.8is X5