Why is oil mixing with water in reservoir only and not in engine

Asked by Feb 14, 2017 at 01:08 PM about the 2007 BMW 3 Series 328i Sedan RWD

Question type: Maintenance & Repair

4 Answers

28,995

Could still be a head gasket, they can leak oil into water passage without coolant going into oil. Time for a compression test, may want to run Block Tester as well.

1 of 1 people found this helpful.
86,285

Oil floats on water so it may be making its way to the reservoir which is at a high point.

76,335

If this is an automatic, it is possible the trany oil cooler inside the radiator has a leak.

2 of 2 people found this helpful.
65

Not familiar with the 320i but the 328 and stuff have a problem where the oil filter housing gasket leaks and mixes the oil into the cooling system.

1 of 1 people found this helpful.

Your Answer

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 33,026 nationwide 3 Series listings starting at $1,200.

ZIP:

BMW 3 Series Experts

  • #1
    Tom Demyan
    Reputation
    5,210
  • #2
    Robert Charlson
    Reputation
    1,670
  • #3
    grolyate
    Reputation
    1,270
View All

Related Models For Sale

Used BMW 5 Series
575 Great Deals out of 15,865 listings starting at $1,650
Used BMW M3
37 Great Deals out of 2,083 listings starting at $4,200
Used Mercedes-Benz C-Class
912 Great Deals out of 28,353 listings starting at $2,001
Used Audi A4
320 Great Deals out of 12,648 listings starting at $1,899
Used Ford Mustang
603 Great Deals out of 39,738 listings starting at $1,988
Used Mercedes-Benz E-Class
720 Great Deals out of 22,934 listings starting at $1,450
Used BMW X5
371 Great Deals out of 15,982 listings starting at $3,495
Used BMW 7 Series
121 Great Deals out of 5,233 listings starting at $1,750
Used BMW 6 Series
73 Great Deals out of 2,460 listings starting at $5,995
Used Honda Accord
1,115 Great Deals out of 74,391 listings starting at $1,100
Used Dodge Charger
442 Great Deals out of 33,929 listings starting at $1,999
Used BMW X3
280 Great Deals out of 9,464 listings starting at $2,648
Used BMW 1 Series
51 Great Deals out of 1,032 listings starting at $5,283

Used Cars For Sale

2016 BMW 3 Series 328i Sedan RWD For Sale
9 Great Deals out of 299 listings starting at $18,777
2015 BMW 3 Series 328i Sedan RWD For Sale
10 Great Deals out of 551 listings starting at $14,899
2014 BMW 3 Series 328i Sedan RWD For Sale
56 Great Deals out of 826 listings starting at $14,888

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.