if I remember correctly, you'll have to either put the front end up on ramps or jack it up. Get a really long flat headed screwdriver and get to the clamp's screw from the left side of the motor through the engine bay. If you do this and it doesn't seem feasible, you might have to remove the skid plate.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean