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      10-12-2024, 03:52 PM   #1
F30 Ashton
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Why my B48 drinking all my Oil

I own a B48 2017 330I xdrive bmw with 59K miles and recently ive gone through 5 liters within a month of owning and less than 900 miles driven since i got it. With my past BMWs i know they suck up all the oil but this is not normal, I don't have any codes or physical problems with the car and yet it preforms perfectly. It doesnt leak at all (surprisingly) But my question is where is all this oil going if its not burning and running rich or leaking, and what parts would fix this issue? I just recently replaced the crankshaft ventilation valve hoping that would fix the issue yet it still sucks up all the oil, Im taking it in to BMW for the coolant hose recall and hoping they can help me with this issue, Any tips on parts that could contribute to fix this issue would help. Im a teenager with limited knowledge on cars and anything would help. Thanks bimmer pros!
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      10-13-2024, 12:13 PM   #2
Wires
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If you are losing that much oil it's either:
1) In your coolant
2) Burning out the tailpipe - you'd be seeing smoke
3) Leaking
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      10-13-2024, 03:15 PM   #3
keithyo88
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It could be useful to get records of work on your car. There are posts about iDrive and records that bmw has. How your car was driven and maintained are key. Good luck.
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      10-13-2024, 05:48 PM   #4
im_an_alien
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How do you know it's losing that much oil? Is the car asking for more or are you going by the i drive measurement? If your oil level sensor is faulty you could be overfilling the car. Perhaps when you bought the car it was very low to begin with. At this point I would just drain the oil and see how much comes out, then fill with a known amount and go from there. 5L a year is not normal, let alone 5L a month.
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      10-16-2024, 11:27 AM   #5
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Quote:
Originally Posted by Wires View Post
If you are losing that much oil it's either:
1) In your coolant
2) Burning out the tailpipe - you'd be seeing smoke
3) Leaking
1) Coolant is normal
2) i dont see smoke from my tailpipe or hood and doesnt smell like the car is running rich
3) As a family of bmws our driveway is covered with oil but mine is the first that doesnt leak.
Yesterday i got another low oil message after about 500 miles and it gave me a super rough idle, almost struggling to stay alive, Im stil super lost of what part would make this happen
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      10-16-2024, 11:28 AM   #6
F30 Ashton
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Quote:
Originally Posted by im_an_alien View Post
How do you know it's losing that much oil? Is the car asking for more or are you going by the i drive measurement? If your oil level sensor is faulty you could be overfilling the car. Perhaps when you bought the car it was very low to begin with. At this point I would just drain the oil and see how much comes out, then fill with a known amount and go from there. 5L a year is not normal, let alone 5L a month.
When i got the car i did a oil change and saw the computer was right about my oil level and once the oil is low i get a rough idle, So sure my computer is right
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      10-16-2024, 11:30 AM   #7
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Quote:
Originally Posted by keithyo88 View Post
It could be useful to get records of work on your car. There are posts about iDrive and records that bmw has. How your car was driven and maintained are key. Good luck.
I need to get those but i bought the car with a salvage title from flood damage but theres no visible rust or signs it was actually in water, but the person i bought it from was into the car and took good care of it, atleast with the oil changes.
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      10-16-2024, 12:21 PM   #8
sakarzac000
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Quote:
Originally Posted by F30 Ashton View Post
I need to get those but i bought the car with a salvage title from flood damage but theres no visible rust or signs it was actually in water, but the person i bought it from was into the car and took good care of it, atleast with the oil changes.
Flood damage doesn’t always necessarily mean rust. A ton of other problems can come from a flooded car, like hoses losing it’s seal. How high was the water level on your car?

Also for leaks, the undercarriage cover on your car is absorbent. Have you taken the cover off and inspected that?

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May the B58 coolant gods show mercy on us all.
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