The 3.0's prior to 11/31/08 have a defect in the motor. This is really related to ticking heard from the engine in the form of valve noise. The defect specifically relates to the head. For customers that complain and the diagnosis is done via the dealer, they will replace the head assembly with the newer part.

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