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2009 BMW 750 blue smoke when idling

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when Idling for a long time car has a blue smoke. Even when stopped at a red light for a long period of time when take off blue smoke. I was told it was the valve seals on all the 7 series

It very well may be the valve seals. Get a compression test to confirm it’s not the Piston rings.

From what you describe… classic valve seal problem.