I have a 2004 745li smokes blue out of one pipe not heavy. Also one of the vertical cylinder shaped motors or pumps on top of valve cover is leaking oil upwards. Like under pressure. Get codes saying

what do the cades say and what does the exhaust smell like is it very gaseous

smells a little of gas not heavy. Codes said secondary fuel air pump relay circuit malfunction. And the other air fuel bank 2 malfunction. Can't remember specifics cause I don't have them in front of me. Sorry will this help?

does the smoke thin out and go away after the vehicle warms up

I think something to do with emissions

Yes it does thin out and go away. Right away

does your smog pump work

can u send a pic of that cylinder you spoke of

Sure give me a sec. It's under a cover

Blue Exhaust Smoke A clear sign that oil is being burned in the engine is blue smoke coming from your vehicle’s tailpipe. Oil can leak past where it’s meant to be if piston rings or valve guise seals are worn out. This leaking can allow oil into the combustion chamber, where it will be burned like fuel. If you see what looks like blue smoke, be sure to check your oil often and be aware of possible overconsumption that may be occurring. While you should normally seek attention as soon as possible, since internal repairs may be the next step, an older vehicle with blue smoke may not be so crucial; as long as the leak is minimal it can be maintained by topping off your oil regularly.

It won't let me, how?

Ok thank you.

but it would not thin out if it was an oil burner it would blow more whenever you press the gas pedal down

I have a 2003 bmw 745 li when I stop for a sec at a light or any were thin take off again I have blue smoke coming out my tail pipes as well