while driving on freeway a puff of white smoke comes out the exhaust

Asked by Oct 08, 2014 at 08:17 PM about the 2005 BMW X5 3.0i AWD

Question type: General

driving on the freeway about 75 miles an hour, then all of a sudden i see white smoke
coming out the exhaust

2 Answers

35,355

Is it pure white smoke or does it have a bluish tinge? Bluish white smoke is likely burning oil. Pure white smoke might be steam. Check the oil and see if there is any coolant in the crankcase. White smoke might be water/coolant getting into the combustion chamber, signs of a leaky head gasket or worse a cracked head. Bluish white smoke is oil being burned in the combustion chamber. Do you get any misfiring at the time? If - again if - you are getting a misfire it might be a valve not opening/closing at the proper time and oil from the valvetrain is getting into the combustion chamber and being burned off. That situation could from bad lifters, bad valve lash adjusters, worn valve guides, etc. especially if it's a high mileage motor or had poor maintenance/lack of regular oil changes. If it were something like bad piston rings you'd have burning oil continuously, but more noticeable under load.

3 people found this helpful.

I have purchased a brand new X5 in india and driven only 500kms the same thing happened to me I immediately pulled over and call the BMW dealer they say its normal and related to un burnt gases, I am still not convinced. Does anyone have a realistic reason

Your Answer

BMW X5 Experts

  • #1
    Tom Demyan
    Reputation
    2,040
  • #2
    Robert Charlson
    Reputation
    790
  • #3
    Asiamah6910
    Reputation
    750
View All

Related Models For Sale

Used BMW X3
189 Great Deals out of 11,218 listings starting at $1,900
Used BMW 5 Series
381 Great Deals out of 16,281 listings starting at $1,650
Used BMW 3 Series
823 Great Deals out of 32,400 listings starting at $900
Used Mercedes-Benz M-Class
239 Great Deals out of 5,937 listings starting at $800
Used Land Rover Range Rover Sport
122 Great Deals out of 7,178 listings starting at $4,500
Used Jeep Grand Cherokee
774 Great Deals out of 75,761 listings starting at $899
Used Porsche Cayenne
100 Great Deals out of 5,263 listings starting at $4,495
Used BMW 7 Series
118 Great Deals out of 4,790 listings starting at $3,950
Used Acura MDX
262 Great Deals out of 14,772 listings starting at $1,271
Used Mercedes-Benz GL-Class
131 Great Deals out of 3,377 listings starting at $6,900

Used Cars For Sale

2018 BMW X5 For Sale
43 Great Deals out of 9,895 listings starting at $47,876
2017 BMW X5 For Sale
27 Great Deals out of 739 listings starting at $39,000
2016 BMW X5 For Sale
11 Great Deals out of 361 listings starting at $28,881
2015 BMW X5 For Sale
66 Great Deals out of 2,135 listings starting at $20,998
2014 BMW X5 For Sale
17 Great Deals out of 530 listings starting at $24,795

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.