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

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

25,855

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 of 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
    1,680
  • #2
    Robert Charlson
    Reputation
    710
  • #3
    Asiamah6910
    Reputation
    570
View All

Related Models For Sale

Used BMW X3
271 Great Deals out of 12,114 listings starting at $2,900
Used BMW 5 Series
457 Great Deals out of 16,420 listings starting at $2,000
Used BMW 3 Series
1,019 Great Deals out of 31,251 listings starting at $1,000
Used Mercedes-Benz M-Class
204 Great Deals out of 5,670 listings starting at $2,500
Used Jeep Grand Cherokee
869 Great Deals out of 70,866 listings starting at $995
Used Porsche Cayenne
106 Great Deals out of 4,704 listings starting at $3,999
Used Acura MDX
358 Great Deals out of 18,132 listings starting at $1,875
Used BMW 7 Series
162 Great Deals out of 5,993 listings starting at $2,500
Used Mercedes-Benz GL-Class
142 Great Deals out of 3,596 listings starting at $7,890
Used Land Rover Range Rover Sport
163 Great Deals out of 5,596 listings starting at $5,995

Used Cars For Sale

2017 BMW X5 For Sale
34 Great Deals out of 5,247 listings starting at $45,999
2016 BMW X5 For Sale
8 Great Deals out of 369 listings starting at $32,300
2015 BMW X5 For Sale
53 Great Deals out of 820 listings starting at $27,895
2014 BMW X5 For Sale
119 Great Deals out of 1,736 listings starting at $25,890
2013 BMW X5 For Sale
35 Great Deals out of 759 listings starting at $15,923

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.