Do I Have a Problem: Oil Level Sensor?

Incompatible

Active member
 San Diego
07 3.0Si with 15,000 miles on the clock with the electronic oil level sensor; no apparent oil consumption problems. Had a dealer oil change for annual low mileage service about 3 months and 2000 miles ago. As a habit I always check oil level each time I use the car. I realize that with someone else performing the oil change, the actual oil level (a little over/exact/a little under) is unknown due to the characteristics of the electronic sensor. I did get a "full" readout after the oil change and for the last 2000 miles since.

On the way up to participate in the Tour de Orange on New Years Day (great event) the oil level readout indicated one increment low, so on my return I added 1/4 liter of 5-30 BMW oil. My expectation was that the readout should now indicate the level at full; the readout still indicates one increment low. Do I add more oil? Another 1/4 liter, less, more? Is this an idiosyncrasy of the sensor? Is the sensor not reading accurately? Any thoughts are appreciated. TIA
 
gannet said:
Have you driven it since adding oil....
My concern is due to the lack of change in the level reading even after adding the 1/4 liter of oil.

gannet said:
....and you are measuring while hot?
Engine is well warmed up and measured over the same section of road on my way into work (level freeway, 20 minutes into drive).
 
*could" be that it was almost at the 2 blob level, but not quite, so 0.25 litres could add it to above 1 blob level, but not full.

I would add a much smaller amount next to check.
 
With the electronic dipstick oil should not be added until the yellow light comes on, and then it should be one litre (According to the book anyway)

I also find that the gauge can fluctuate slightly and wouldnt recommend adding oil on one reading alone, if this isnt the first reading though as PVR said though could be near the next drop which is why the gause hasnt returned to 100%

It's nice and easy to check with the electronic dipstick, but I would like the physical one though to double check.
 
Quote:
Originally Posted by bten
If it does not indicate overfill, and still reads "OK", I would just leave it alone. I woud drive it for a day or so and check it again. It has been my experience that the sensor does not immediately react to a change. I had an overfill issue, and had them take out the oil and start over. It still said overfill, but the service guy told me to drive it for a couple of days, and the sensor would reset. He was correct.

Thanks for the post, the sensor does appear to have a response lag based on my additional developments. To recap: Return home from Tour de Orange drive with readout showing one division low, add 1/4 quart, car sits for several days. Drive to and from work, each way about 30 min drive time, sensor still reads one division low each way. Drive in to work today and sensor reads full.

It appears that this is a quirk/aspect of the oil pressure monitoring design. Possibly a long interval average to counter short interval variations from oil temp, cornering, road incline...? Thanks again for the post and for contributing to the forum.
 
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