Burning oil

Asked by Sep 14, 2016 at 12:20 AM about the 2005 BMW 5 Series 525i Sedan RWD

Question type: General

I have a 2005 BMW 525i with 120,000 miles on it. For the
past few weeks it has been blowing off blue smoke(oil)
just about every time I start the car. The amount of smoke
along with the duration of how long it last fluctuates from
time to time. Recently has gotten worse with a very large
amount of smoke every now and then. Usually burns for
about 8-15 seconds then stops. While I've had this issue
for a few weeks, I just recently got a message on my
screen saying "increases emissions. I have no clue what
the problem is..... Any idea?

5 Answers


That is your valve stem seals that are worn. (Head job) if u keep driving it, it'll plug up ur catalytic converter


So true, but you also forgot to mention it will also wipe out the O2 sensors.


Could be an engine issue as mentioned about, but the BMW use a elaborate crankcase vent system/, referred to as the CCV system. A blockage or crack in any of the hoses will allow engine oil to not get recycled through the system and you end up dumping oil into the engine, hence burning more oil. I would replace the hoses and PCV or cranckcase valve, they usually need replace in the 80-120K range.....http://www.youtube.com/watch?v=YWXtiCwRH-k

1 of 1 people found this helpful.

https://www.fcpeuro.com/products/bmw-pcv-breather-system-kit- m54-uro-m54pcv

Best Answer Mark helpful

You can hope Tom is right and you do not need engine work- do you have a qualified BMW mechanic? Well.........DO YOU?!

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