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How common of a problem is this... And can the job be done with the heads on, on a X5? I got the same problem... The worst thing is I had the valve covers and the upper timing covers replaced last year... An right after the tech told me that the valve stems were fried... I was like, why did you tell me in advance! I would have paid the extra to get the stems replaced too... I'm almost thinking that it should be changed when the valve covers are removed as a preventative measure...
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