JettaRed

iTrader: (1)

NOTE: I'm posting here because this forum gets a lot of technical interest.

I changed my oil yesterday and within 2-3 minutes of driving (not sitting idle), I get the message Check Engine Oil At Next Refueling. I did this on my M276 3.0 liter biturbo. I drained about 6.7 liters and filled back in 6 quarts and figured I would top off once the oil was well circulated. I did check the oil level and added ½ quart to put the level toward the top of the measuring area. I have NEVER had this happen in the 3 years and nearly 30,000 miles I have owned the car. I did, however, use a new oil filer housing, so I may put the old one back on.

There's been discussion about this in the C63 forum, but the discussion was inconclusive. The odd thing about such a message is that there is no sense of a real emergency. If I had a full tank, next refueling could be a week or so.

There were no STORED or active (CURRENT) codes when I ran a scan. The message disappeared when cycling the car. So, my question is, should I be worried? What do we know about this message?

W205C43PFL

That is strange, this usually means the engine oil level detected is too low. As our engines don't have an electronic oil sensor that detects overfill (at least not that I am aware of) it does alert when oil is too low (as far as I know.)

JettaRed

iTrader: (1)

Mine could have been a little low since the oil was close to the bottom of the dipstick, but still showing. When this first happened, I was going uphill a bit, but the second time was after I added oil.

Strange that it happened after changing the oil and using a new oil filter cap/housing.

threeMBs

I assume consensus is that this is not related to disconnecting oil pump solenoid awhile back (per an other thread), correct?

PeterUbers

Could be bad sensor

https://mbworld.org/forums/e-class-w...d-warning.html

W205C43PFL

Definitely has nothing to do with it. These engines don't even have an oil pressure sensor.

PeterUbers

this would be the first report of anything like this that I have seen after unplugging

JettaRed

iTrader: (1)

Could be, and perhaps is. But that thread was about oil pressure, not oil level.

PeterUbers

Sure thing, so what you're saying with your italics is that they are misusing the term oil pressure sr sensor and oil level sensor.

CaliBenzDriver

... or a combination of leaky sensor and "oil-in-harness" or swamped connections (*).

I have only seen the oil level sensor on EPC parts diagrams.

Save your new oil jugs, you may reuse them to drain new oil out . This is an invitation to go remove the middle belly pan and add a magnetic drain plug while at it.

+++++ HEAVY RAIN...
I recall recently JR saying he was driving in a heavy summer storm... Here!

I know MB harness connectors seals are ineffective at stopping water (BlindSpots radar killer!).

Here I bet 80% chance the oil level connector got soaked. This read like an invitation for all of us to be proactive.

This is also what causes odd connection failures located down low :

• A/C compressor duty-control valve
• A/C pressure sensor at condenser
• Electrical Steering Rack (silicone!!)
• (rusted main GND strap)
• Exposed front bumper connector on right side
• Headlight connectors
• Winshshield washer tank
• .....

I also bet the oil level data is going to be heavily doctored by ECU to prevent false trigger for up-hill/down-hill variations. So may not be easy to correlate scanner datastream.

JettaRed

iTrader: (1)

This has nothing to do with disconnecting oil pump solenoid. I've had it disconnected on this car since last November and 6500 miles ago.

As mentioned, I installed a new oil filter housing (the black upside-down cup thing that holds the filter element). Nothing was wrong with the old one but thought it might be prudent since the car is 10 years old. So this morning, I checked the oil and it was full to just a little above/touching the max level. But once starting the car, turning off, and letting it sit an hour or so, the oil was at the bottom of the dipstick. I removed the new housing, swapped the new filter over, and put the old one back on. My wife and I took a drive on both the highway and back roads, making several stops. We probably put about 100 miles on the car. NO MESSAGE. I'm beginning to think it was the new housing, but not sure why. Maybe the anti-drain valve was too stiff? Gonna keep an eye on it.

W205C43PFL

Does it have anything to do with the oil bypass valve of the new one?

JettaRed

iTrader: (1)

That's what I am thinking. Strange as it may be for a new Genuine Mercedes part, that valve may have slowed the return of oil to the pan too much. I tried pressing in it and it felt really stiff. However, this morning when I removed it, there was no oil spilling all over the place. The filter was saturated but any oil in the housing had drained back down overnight.

JettaRed

iTrader: (1)

As I think about it, I don't know how the bypass valve would cause this. However, what I do know is that the bypass valve is the only moving part to the housing and the message has never appeared with the old housing. This could be completely coincidental, but when you change something (the housing) and there is a new effect, it kinda points to what you changed.

W205C43PFL

I see, yes perhaps.

BlownV8

6.8 quarts is the recommended oil amount, and you added 6.5 quarts, correct? Is it low on the dipstick? If so, add, at least, another quart and see how it goes. I'm betting the last shop or person that did the oil added 8 to 8.5 quarts which is about average for many models and that's why you got 6.7 liters out. If it is happy at that level, again, give it another quart and monitor.

JettaRed

iTrader: (1)

I do my own oil changes and have always done them the same way. I did pull out approximately 6.7 liters and have since added another 200 ml or so to get the lever back to where it was.

S-Prihadi

Interesting message on the IC.
Check engine oil at next refuelling
Seems no urgency at all
Since this/our engine has no oil pressure sensor from MB, it must have meant oil level..... but not a LOW OIL LEVEL warning.

Our oil level sensor is a dummy one, it is either ON ( Low oil ) or OFF ( oil level OK ). It is not the true oil level & quality sensor like in M157 ( smartest ) or oldie M271.9 ( decently smart ).

Did you reset the oil change days/mileage counter after the oil change ?

What I think what may have happened is below :
You have your engine key ( assumed manual key in use ) in the slot, thus engine computer never really goes into deep sleep.
Or you use the PUSH TO START button, and your key in inside the car, also engine computer never really goes into deep sleep.
When you drained the old oil, ECM recorded Low Oil Level and when you refil with new oil, ECM detected normal oil level.
Above and not resetting the oil change days/mileage counter.....Maybe this is why that non urgent warning appeared : Check engine oil at next refuelling

I do not use PUSH TO START button, I hate that. I use manual key insert.
When I do oil change, I put my key FOB far away from the car, I want to make sure my ECM goes to deep sleep mode.

------------------

If you have not done resetting the oil change days/mileage counter, please do so and re-install the new engine oil filter housing.
See how it goes from there.

M276.8 Turbo is a 6.5s liter engine oil with new oil filter. 6.7 liters is OK, 7 liters is too much.

JettaRed

iTrader: (1)

Thanks for your feedback.

I'm not sure where the key was. I always use the start button in normal circumstances. But the car may have been ON (not running, of course) because I was checking the emissions readiness for an upcoming emissions test. But I have owned the car since December 2021, approximately 29,600 miles, and eight oil changes, and have never had this happen before. All my oil changes have been at 3000 and 5000 miles intervals. There is the possibility that I missed resetting the reminder a couple of times, but why isn't this a more common thing here? Searching the entire site, I would think this issue would have shown up often with most people following factory intervals of 10,000 miles.

Lastly, the warning message seems to have been reset by cycling the engine off and on. When doing a full car scan, there were no DTCs detected. When live streaming data to the ECU, the oil level showed NORMAL. But that was after the message was off. IF it happens again, I will try to scan for any codes before turning the car off. In the meantime, I have ordered a new oil level sensor (genuine Mercedes) from FCP in case this happens again. The message may be harmless, but it is disconcerting.

JettaRed

iTrader: (1)

Happened again. This time I scanned for codes before turning off the engine. Central gateway (CGW) was the only module with faults. These were the only codes:

CaliBenzDriver

These 2 faults don't appear related. The oil level sensor is hooked directly to Engine Control, not networked.

Do you remember when you last pluged-in your tune uploader dongle ?
Your CGW does: read freez-frames stamps.



> Random oil sensor fault...
Go inspect sensor connector for oxidation crusties or oilyness armed with silicone RTV for no-repeat protection.

At least the engine has a viable dipstick for eyewitness sanity!


> .... "Could Not Reproduce" : CGW GETS A FIX!
The Bosch CAN is resilient enough to keep running with detuned output when CGW is bugged out.

I still can't believe Bosch networking is proven to impact the performance of both engine + tranny error-free.
​​​​​​
Simple chassis reboots FIX NOTHING but really help. I am going to share this reboot how-to pics.
​​​​​​

S-Prihadi

STORED or CURRENT ?

MB2timer

I am not sure if I am educating anyone, but oil pressure and level are often closely related. Low oil quantity will result in low oil pressure. High oil level, especially when cold, can lead to high oil pressure. Oil temperature also correlates closely with oil quantity.
Apologies if I am stating the obvious.

CaliBenzDriver

Welcome back on terra-ferma after your trip at sea

95% chance these are STORED.
These are not transient faults.

This trully happened when DLC was used by dongle.

DLC open diagnostic port is not too robust to support additional payload.

JettaRed

iTrader: (1)

On the same day I changed my oil, I also loaded the factory stock file to my ECU. One of the very few drawbacks, if not the only drawback, of the Stage 2 tune is that two of the smog codes never become ready. The two codes have something to do with the o2 sensor or something. I had to get my car smog tested, so I loaded the stock file and drove the car for a few days to get all the codes to a ready state. That is when the first message appeared after driving about ¼ mile. Since then, I completed (and passed) my smog test and have reloaded the Stage 2 file. And I got the message again (now 4 or 5 times). The two faults in the CGW were STORED.

@BenzNinja spent about an hour looking at my car yesterday and could not find any errors using both XENTRY and DTS Monaco (which apparently can dive much deeper than XENTRY alone). Since my oil level was good, he believes the message concerns oil quality, not quantity (i.e., 229.5 vs 229.3). But we checked and it seems the software always defaults to 229.3. The oil quality setting is used to determine the travel intervals (mileage) between oil changes. Everything was reset to zero.

My conclusion at this point is either it's a bad connection (as Cali suggested) or a failing oil level sensor. The car also just turned 50,000 miles and probably actually 10 years old. I have a new sensor on order. It's about $50 for a Mercedes Genuine part from FCP.