# 2009 BMW 750 blue smoke when idling

**URL:** <https://community.cartalk.com/t/2009-bmw-750-blue-smoke-when-idling/153692>\
**Category:** Maintenance/Repairs\
**Tags:** bmw, 750\
**Created:** [November 28, 2019, 4:33pm UTC](https://community.cartalk.com/t/2009-bmw-750-blue-smoke-when-idling/153692 "2019-11-28T16:33:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![LeandreThornton](https://avatars.discourse-cdn.com/v4/letter/l/ee59a6/32.png) [@LeandreThornton](https://community.cartalk.com/u/LeandreThornton)\
**Post date:** [November 28, 2019, 4:33pm UTC](https://community.cartalk.com/t/2009-bmw-750-blue-smoke-when-idling/153692/1 "2019-11-28T16:33:42Z")

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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

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**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\
**Post date:** [November 28, 2019, 6:36pm UTC](https://community.cartalk.com/t/2009-bmw-750-blue-smoke-when-idling/153692/2 "2019-11-28T18:36:08Z")

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

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [November 28, 2019, 10:01pm UTC](https://community.cartalk.com/t/2009-bmw-750-blue-smoke-when-idling/153692/3 "2019-11-28T22:01:41Z")

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> [@LeandreThornton](#):
>
> I was told it was the valve seals on all the 7 series

From what you describe… classic valve seal problem.