I am experiencing problems with my BMW 320i - 2004 model. It does not start easily. When it starts, a blue fuel smoke comes from the exhaust. this causes the car also to be heavy on fuel consumptio

SOURCE: 2001 Mercedes E220 CDI exhaust black smoke on acceleration

hello,according to service information;smoke formation or si 07.16-p-0004a (service inform) from mb ,your engine have normal function,if you want ,ask your dealer about the service inform with number 07.16-p-0004a,you can read the explanation regarding your problem,ty

SOURCE: Blue smoke from exhaust on first start up

Blue smoke come from burning oil.  This means that you have an oil leak somewhere that it is getting burned up and exiting the muffler.  First thing I would do would be to check your engine oil level.  After you are sure that it is good, I would suggest taking the vehicle to a mechanic to have them see if they can find where the leak is.  Let me know if you have any other questions.  Thanks for rating my response and for using FixYa!

SOURCE: I have a BMW Z4 2003 2.5 with the exhaust emission

The Exhaust Emission Light can come on if the car is driven slowly over short distances.It will not happen on cars driven at speed. A short trip of ten miles at over 3000 revs should reset the warning light,although it may not go out for a couple of days after you have tried it . Hope this helps and saves a bill at the local dealer. JK

SOURCE: Blue smoke sometimes when I start my 2004 Boxster

Te blue smoke is oil getting into the piston/fire chamber..

If it is only at start-up - it is more than likely the valve seals.. Allot of the time they use plastic ones so therefor it is somewhat common for cars to do this..
If it is not to bad and stops soon after start-up,, its not really a big deal..

IF it is allot - and smokes all the time - it could be that the valve seals need to be replaced OR could be the piston rimgs are shot..

Please dont forget to rate well ;o)

SOURCE: bmw 320d engine shaking

You have blown the oil rings.