Liked mentioned in SMS, the fact they all do it indicated not likely a problem. In the M62 I rebuilt due to timing chain that broke, only about 1/4 of the valves were damaged. You only had one bank one cam that was freewheeling.

I think you'll have to start it to get a proper leak down test.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)