I have been getting the warning usually on 20+ mile trips. But when I check the Oil it is correct and recheck after it has been garaged overnight and the level is correct.

I am running Valvoline 5w40 Synthetic, the car runs perfect and has over 278k miles. Is this oil too thin for Dallas weather?

Any clue(s) as to why this may be happening?

__________________
06 MB E320 CDI 123k miles
14 Sienna (wife's DD) 36k miles
11 GL350 Bluetec 136k (Sold)
96 E300; 292k+ miles (Donated)
11 Sprinter 22K+ miles (Sold)

My '96 E300 also uses 5W-40 synthetic and the low oil warning is quite conservative. It starts complaining a quart too soon, IMO. My '95 E300 is similar.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

This a possibility as it happens to my 300SDL but it is not the same car. The o-ring on the oil filter stick is worn or not exist. Oil is drained back from oil filter to the tank when stationary or over-night. Oil level is correct every time I measure it but it is low when oil is pumped back to the oil filter. So check the O-ring next time you change your oil.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

The sending unit could be going bad.

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Thanks everybody for your response, glad that it is not my aging engine.

I do change the "O" rings every time I change oil. "SherTX" may be correct regarding the sending unit.

__________________
06 MB E320 CDI 123k miles
14 Sienna (wife's DD) 36k miles
11 GL350 Bluetec 136k (Sold)
96 E300; 292k+ miles (Donated)
11 Sprinter 22K+ miles (Sold)

My 91 350SDL has the light on for a while each morning when I start up cold, it stays on maybe 3 minutes. Then it will go out and not see it again all day. I'm not sure whats up with that, but I ignore it. It is not low on oil.

__________________
1991 350SDL 350k+ miles

I need to clarify one thing my Oil Level Warning light comes on while while I am on the Freeway cruising 65-70 MPH. Light does not come on when I start and only when it is at full operating temp. I wonder if that makes a difference.

__________________
06 MB E320 CDI 123k miles
14 Sienna (wife's DD) 36k miles
11 GL350 Bluetec 136k (Sold)
96 E300; 292k+ miles (Donated)
11 Sprinter 22K+ miles (Sold)

Shortly after I got my '97 my oil level warning came on doing 70 mph - got home and the dipstick read half full. Only other time was right after I changed the oil once, again the dipstick read (only) half full. So just saying, my sensor is pretty fussy, I keep it at 3/4 full.

Suggestion - If it isn't already, carefully add oil so it reads near the top line on the dipstick, and see if the warning light stops coming on.

__________________
Charlie

---------------------------
'66 VW 1300 96K miles
'97 E300D 239K miles
'85 300D 203K miles (sold Sep 2012)