If there is a problem with CCV there will be symptoms such as using more oil, smoke out the tail pipes, engine running rough or even unusual noises from under the hood. There are some shade tree tests that always cause a debate of their worth. The only test that is not challenged is the test used by BMW techs, not necessarily those at the dealer.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas