[Black440iF32]

Hi guys!

I posted this question on the F32 forum some weeks ago, but I did not get many responses from other users. Since your 240's use the exact same engine, I thought I'd try and see if there is a lot of B58 knowledge and experience here.

Let me shortly introduce myself. My name is Lars and I'm joining you from the Netherlands. After previously owning a E92 325i, I recently treated myself to a march 2019 F32 440i.
The car is very fresh, with only 39k miles/62k kilometers.

So far there have been no real issues, but one 'issue' is on my mind and we (myself and the dealer) don't really seem to be able to resolve.

That's why I'm hoping that fellow B58 owners can help me out.
Any advice is highly appreciated, I don't take your time and energy for granted.

Ever since receiving the car, it has been having troubles measuring the oil level when up to the operating temperature. Basically, every drive longer than 30 minutes results in the measurement stopping at give or take 20%.

Of course, I'm aware of the oil pump issues that have plagued the G3x models M340i with the B58 TU engine. BMW's brilliant idea to make the plastic ring thinner.

My car, being a march 2019 non-tu build, has the 11417643046 pump, not the now discontinued 11418646453 pump. I believe the pump with metal ring is the 11419895359.

Of course, I started with having the car diagnosed by BMW through ISTA. No errors where found. The car runs and drives absolutely fine, and there are no sounds coming from the oil pump.
To start somewhere, we decided to change the oil and replace the oil level sensor by a genuine BMW part.
The oil was refilled with 6.5 liters of 0W30 BMW spec oil.
Unfortunately, the 'problem' still existst.

The car was also updated to the last firmware by BMW and completed an ISTA oil pump test without any faults.

I use Bimmerlink to track the oil pressure and temperature when driving and I found no abnormalities.

Idling warm: 2.5 bar to 2.9, depending on temperature
When 'half warm' and performing an oil measurement, the engine raises RPM to ~1100 and measures a steady 3.0xx bar of oil. Only minor fluctuation is visible. A faulty pump would cause higher and more fluctuations, says the dealership.

When the engine oil reaches 108 degrees (on idle) the measurement starts and the oil pressure is 3.2xx to 3.3xx bar and it starts to fail around 20%.

I'm at a loss here. BMW Germany has advised my Dutch dealer to replace the oil pump. If I need to, I will. But i'm not into replacing components that are not faulty, at my own expense. Based on everything I have tried and researched, I'm not yet convinced that a new oil pump will fix my issues.

Has anyone with a gen 1 B58 experienced the same issues? What causes it and what fixed it? Does the engine simply run 'too hot' for an oil measurement? Do I need to have adaptations reset? Recalibrate the oil level sensor?

Like I said, the car drives fine and I continue to drive it for now. Of course, this 'problem' is in my head. So I'm not as confident driving the car as I would like to be, until this problem is either resolved, or I'm convinced it is normal B58 behaviour.

Thanks for your insights!

Cheers,
Lars

[freakystyly]

I think it should be similar since the overall systems are similar between generations of engines... You're likely well aware of these.

Car must be on level ground.
Up to operating temperatures - 90C approx.
Oil filter cage present and connected in the correct orientation (the plastic inside your filter)
O rings present

Would you be able to remove and check your oil filter? Not many people have the 32mm socket needed.

It's always best to start with the easiest bits before the parts canon comes out.

[Black440iF32]

Originally Posted by freakystyly

I think it should be similar since the overall systems are similar between generations of engines... You're likely well aware of these.

Car must be on level ground.
Up to operating temperatures - 90C approx.
Oil filter cage present and connected in the correct orientation (the plastic inside your filter)
O rings present

Would you be able to remove and check your oil filter? Not many people have the 32mm socket needed.

It's always best to start with the easiest bits before the parts canon comes out.

Hi Freakystyly,

Thanks for your comment!

Yes, I am well aware of all the precautions that need to be met in order for the car to measure the oil correctly.
The oil filter is new and OEM BMW. I also changed the p/n listed in yellow in the picture attached to this post. The new filter clips in nicely, and the old cap didn't show any abnormalities either.

Unfortunately, no changes, still a failed measurement..

[ZHP to B58]

With how low your mileage is, maybe it's something electrical-related. I've measured my oil a few times over the years just to test it out and make sure that it's working - sometimes, it'll stop at some point and I'll retry it 2-3x and it still won't work. But then after driving around ~5-10 minutes again and parking, it'll then work. My mileage is >125k miles.

[Black440iF32]

Originally Posted by ZHP to B58

With how low your mileage is, maybe it's something electrical-related. I've measured my oil a few times over the years just to test it out and make sure that it's working - sometimes, it'll stop at some point and I'll retry it 2-3x and it still won't work. But then after driving around ~5-10 minutes again and parking, it'll then work. My mileage is >125k miles.

Hi ZHP to B58,

Thank you for your reply!

I'm starting to think, based on all I've researched and heard so far, that this is a common F32 problem, due to the way the measurement is setup.

0W30 is thin oil, especially so at higher temperatures. There is a lot of internal oil circulation at higher temperatures and 'high' oil pressure. The thermical measurement requires a stable flow in the measurement. Even a small variation can trip the sensor.

The oil pressure is perfect and stable, there are no error codes, no loss of pressure, no fluctuations.

I'm still looking forward to hearing and learning more from fellow B58 owners about their experiences, but I'm not convinced changing the oil pump now is going to lead to any improvements.

I'll keep an eye on pressures and I measure after letting the oil 'rest' for a few minutes and restarting the engine.

Thanks again for your reply and any other replies that might follow!

Cheers,
Lars

[Kernel Kurtz]

Oil level sensor failed way back when on my '07 328xi. Was stupid not having a dipstick back then, and still is. Sorry I can't help with your problem OP, just thought I would say that again almost 20 years later lol.

[n55david]

Usually its the sensor.. had that issue on my 2015 335.. just need to swap it

[freakystyly]

I don't really care for the computer measurement either...

My previous car, an E90 had an oil pan weep that I was "monitoring". It was only 1L per oil change at it's worst. It still ended up cheaper to refill than to pay a mechanic to replace it. The level check on the previous E generation didn't require a "running" test like these F cars.

Best way to accurately test your oil level is to drain and measure unfortunately.

I hope it doesn't steal the joy of driving your B58.