I've noticed other people reporting this in past threads, but have yet to read a reason.

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'81 300SD

Don't know why it would run better, but the dipstick indicates "min" and "max", and the Benz engines typically consume more oil when kept at the max level. Keeping the level at the midpoint seems to reduce oil consumption....

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

Halfway between the marks keeps the rear crankshaft seal from "leaking" too much, if that's what you're thinking about. You're not low until you're below the "low/min" mark, which I don't think I'd want to do.

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daBenz - 1970 220D

In 1967 I ran a gas station in San Antonio Texas. Had a traveling salesman come in daily with a full size Pontiac, he would top off the tank and add oil. Always a quart low... I recommended he leave the oil level one quart low BUT take a spare quart with him just in case. That was the last quart I sold to him except for oil changes. The engine would blow out the quart and then maintain that level.

Luther Carrier

Might you have the wrong dipstick?

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"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

Good info here......thanks!

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'06 E320 CDI
'17 Corvette Stingray Vert

This seems to be even more evident on gasser MBs.....my 300E will "disappear" half a quart pretty quickly when topped to the max mark, but then it seems to settle in around halfway or just below half way between min/max on the stick, and stays there....so thats where I've been topping it too. My 300SD holds the level fine at just below max. Same for the other diesels.....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Same here. Oil disappears when filled to the top notch then stays rock steady about half way between.