By mistake less than 1 cup of synthetic motor oil (5w/30) was added to ATF Oil. Have not started vehicle. What do I do? Do I do nothing or drive/tow car to have transmission fluid changed?

5

Asked by Jan 01, 2015 at 09:39 AM about the 2005 BMW 3 Series 325xi Sedan AWD

Question type: Maintenance & Repair

9 Answers

46,915

I personally wouldn't worry about it. One cup will be so diluted with the rest of the oil, it shouldn't cause any problems.

2 people found this helpful.
9,590

suction gun, we use them to correct trans fluid that is overfilled. If you added it, and then stopped, it is floating on top perhaps. you could draw it out and let it go in a clean pan looking for the color difference. I would dump my trans fluid if it was not correct, but it has a plug for that. everyone else has to pull the pan. Your spec is going to be some specific kind for BMW right? like $5 a quart? now is your chance to get it out of there, if it bothers you.

2 people found this helpful.
9,590

after circulating it, it would be contaminating many more quarts. it would also be in the clutches and get in the converter. many converters have a locking clutch after the 80's or so. I had one with a cup of water in it once, it slipped until it was serviced.

1 people found this helpful.
9,590

You could get a suction gun at a place that has a full service shop and return it after?

1 people found this helpful.
116,335

I would not even chance it, drain the fluid, but the real problem is that the contaminate floats, so as you drain the tranny it is going to adhere to everything it can, the only to get it is to drop the pan and clean, with a good light it should be visible clinging to metal parts, use a good spray cleaner, one that is no residue, put it back together and fill to specs, start it up and cycle the gears, double check the level and that should be that.

2 people found this helpful.
79,235

I agree with tennisshoes. Especially since BMW trannys are very fussy to begin with. Not to mention how terribly expensive they are to fix!! HTH. -Jim

1 people found this helpful.
5

Appreciate all the responses. For now, we used a (clean/unused) turkey bastor to remove about the same of oil that was added, off the top. Can't really tell if the motor oil stayed at the top or mixed with the ATF Oil. We'll call BMW in the morning (non-holiday) for final recommendation(s). Thank you!! Happy New Year!

79,235

You're welcome. Glad to help. Happy New Year to you as well. -Jim

IT'S ALL OK, DON'T YOU WORRY ABOUT, THE AMOUNT OF MOTOR OIL IS NOT ENOUGH TO CAUSE ANY DAMAGE TO TRANS,RELAX AND ENJOY THE DRIVE.

Your Answer:

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 31,690 nationwide 3 Series listings starting at $1,599.

ZIP:

BMW 3 Series Experts

  • #1
    Tom Demyan
    Reputation
    5,860
  • #2
    Robert Charlson
    Reputation
    1,790
  • #3
    Matt Mankinen
    Reputation
    1,410
View All

Related Models For Sale

Used BMW 5 Series
426 Great Deals out of 16,899 listings starting at $1,653
Used BMW M3
20 Great Deals out of 1,530 listings starting at $6,500
Used Mercedes-Benz C-Class
703 Great Deals out of 26,703 listings starting at $1,100
Used Audi A4
229 Great Deals out of 10,917 listings starting at $1,000
Used Ford Mustang
268 Great Deals out of 38,445 listings starting at $1,350
Used Honda Accord
585 Great Deals out of 104,730 listings starting at $1,225
Used BMW 7 Series
107 Great Deals out of 4,862 listings starting at $2,399
Used BMW 6 Series
60 Great Deals out of 2,620 listings starting at $5,999
Used Dodge Charger
301 Great Deals out of 32,310 listings starting at $1,850
Used Mercedes-Benz E-Class
430 Great Deals out of 19,952 listings starting at $1,995
Used BMW X5
332 Great Deals out of 18,878 listings starting at $2,100
Used BMW 1 Series
25 Great Deals out of 888 listings starting at $5,341

Used Cars For Sale

2018 BMW 3 Series For Sale
107 Great Deals out of 8,517 listings starting at $26,276
2017 BMW 3 Series For Sale
81 Great Deals out of 1,922 listings starting at $22,797
2016 BMW 3 Series For Sale
22 Great Deals out of 954 listings starting at $15,498
2015 BMW 3 Series For Sale
202 Great Deals out of 5,292 listings starting at $11,995
2014 BMW 3 Series For Sale
88 Great Deals out of 1,992 listings starting at $9,995

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.