Oil level warning - Mercedes-Benz Forum
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post #1 of 19 (permalink) Old 03-19-2019, 04:16 PM Thread Starter
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Oil level warning

Question concerning '98 E320 we picked up last year...

First oil change, done at local garage - I supplied the filter, crush ring, etc. After the oil change, oil level near minimum error appears, then oil level below minimum error after 15 minutes or so. As per dip stick check, level appears fine.

Garage claims oil sensor wonky after oil change, quoted $500+ to replace, which I skipped.

As FYI: Car currently has 50,000 miles on it, no previous issues with oil level errors. Hasn't burned or leaked any oil in the year we've owned it.

Ideas, thoughts, experience?
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post #2 of 19 (permalink) Old 03-19-2019, 04:28 PM
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500+ is a lot of money but I believe the sensor is inside the oil pan so that would have to come off.
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post #3 of 19 (permalink) Old 03-19-2019, 04:58 PM
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Sensor is most likely bad. You can check the wiring to make sure they didn't damage anything but I doubt they would have because the wires aren't near the drain plug or filter.
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post #4 of 19 (permalink) Old 03-19-2019, 05:19 PM
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Have a look at the TSB below.

My experience with this was, I was having the oil minimum / faulty messages from time to time. I replaced the battery, and the sensor messages magically disappeared. Was it the low battery voltage (only appeared when before I started the car and sometimes) or was it the oil sensor electronics needed a reset ?. Who knows. BTW the sensor has smart circuitry in it to determine the oil level as well as oil quality. That is why it is around 100 bucks. The rest is the hard job of removing the oil pan, and re-installing it.

Is your mechanic honest ?
Attached Files
File Type: pdf oil level sensor tsb.pdf (90.9 KB, 30 views)
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post #5 of 19 (permalink) Old 03-20-2019, 06:43 PM
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Doesn't the sensor just unbolt from the bottom of the pan ?
Is it really necessary to remove the pan first ?
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post #6 of 19 (permalink) Old 03-20-2019, 06:52 PM
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Quote:
Originally Posted by Benzyle View Post
Doesn't the sensor just unbolt from the bottom of the pan ?
Is it really necessary to remove the pan first ?
No, and yes.

The oil sensor is accessed from the bottom for 2001+ cars. This is for 1998 E320.


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Last edited by mrboca; 03-21-2019 at 05:36 AM.
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post #7 of 19 (permalink) Old 03-20-2019, 07:39 PM
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Originally Posted by yoeddy View Post
As per dip stick check, level appears fine.
"fine" can have million variations, so what is it?
If it is not touching max scale, I would add 1l of oil and see if that will quiet the warning.


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post #8 of 19 (permalink) Old 03-22-2019, 05:56 AM
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Avoid overfilling the crankcase. Add just enough oil to raise the level to the "maximum" indication on the dipstick,

'
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post #9 of 19 (permalink) Old 03-23-2019, 01:12 AM
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Is that an M104 straight 6 or the M112 V6? If that M104 is like my old M103 (they shared the same block) the sensor is just on the side of the oil pan, secured by 2 bolts. It is strange that the error appeared right after you got it back. If it is on the side, did the wire get jarred loose?

If it is inside the pan I haven't a clue ;-)
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post #10 of 19 (permalink) Old 03-23-2019, 06:57 AM
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i'm pretty sure 98' had the v6. pre 98' had the I6.
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