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I recently had a similar issue with the M54 engine that was a bad CCV.
Not sure if this applies to the V8, but on the M54 while it is running if you try to pull off the oil fill cap and experience a vacuum that will usually indicate a failed CCV.
The vacuum isn't slight either, I had to really work to get the cap off.
Again, take this with a grain of salt though as I'm not sure it applies to the V8.
If it turns out to be the valve stem seals have you looked into what a rebuilt or low mileage motor would cost vs fixing the seals?
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10-17-2020, 11:30 AM
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