So, the E53 2006 X5 M54 6spMT with 143K miles...
- CV OUTER Boot leaks on the L side.
- The R side shows rubber cracks but no leak yet.

As mentioned above, the OUTER boot has 2 choices. If you look closely,
the difference is mostly in number of ridges: 5 vs 4:

* 31607565316
* 31607507402

I have not done the CV Boot yet but from looking at FCPEuro website (prices
as of Apr 2024), I think I have the "31607507402 type"...

PS: For 31607507402, Autohausaz website says: "For models with
production date through 3/2006. For models with 92mm ID and 24mm ID
boot connections, MUST verify prior to ordering as variations do exist."

I don't have 31607565316 in front of me, but it appears to be made from
"thermoplastic", the hard plastic seen in 2004-2009 Volvo S60, V70 P2
series, which is much better than rubber.

Anyway, even if rubber, I cannot complain that it lasts some 18yrs/143K miles...

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Attached Images

  

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT