I’m assuming you are referring to the OP’s question about hidden oil leaks behind the power steering pump? Having just broken my 2002 X5 down to parade rest and changed the motor, I think the “easiest” way to get to the oil lines and triangular flange back there would be to pull the diff out. I know that you can see and access this whole mess with the diff removed. It’s serious ass pain though.

I can’t say however if you can get to this plumbing by removing the left wheel well. I didn’t remove the wheel well, but it could give a nice clear access to the block. I’ve heard that this is difficult, but it’s got to be easier than reinstalling the diff.

If you do pull the diff out, use the Bentley procedures, but you don’t need to pull the left motor mount as Bentley recommends if you slide the top right bolt in before bench pressing the diff into position. The other 3 are much shorter and don’t interfere with the subframe or motor mount. I thought I could fenegal the diff back in after dropping the motor in and I was very wrong. Motor has to come up a couple inches and the subframe has to come down a couple inches.

The triangular flange has 2 o rings, as do the two oil lines going to/from the block at the flange (one each).

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee