BMW Fumes

[OmanYorkie]

Anyone any ideas why after a distance of about 5 miles, when I pull up, I get what smells like exhaust fumes coming through the heater vent in my 5 series BMW 52 plate. If I go on a long journey say 100 miles and pull up, then a thick cloud of blue smoke fills the cab. When moving there is nothing, only when pulling up. Filters clean, and no exhaust leaks.

[R1Geezer]

you have an exhaust leak somewhere, the fumes are making there way into the heater/vent intake. Probably a small leak that only becomes apparent when hot, ie, expansion. Probably repairable with exhaust paste once you find the leak. Run it in the drive till it happens and have a look round, if you can get it on blocks first you should be able to look round the whole system.

[chas2008]

blue smoke could indicate oil burning , oil leak possibly dripping onto the manifold/exhaust ?