I called the Mercedes in Lafayette La. to see if they could answer my question about "What's is the low oil mark on the E320 without a dipstick?"

When will the computer tell me the oil is low, 1 quart or 2?

The service man said the computer will not tell me the oil is low until the oil level in the engine is 2.1 quarts low.

Just in case someone else was thinking about the same issue, now we know.

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1998 Land Rover Range Rover 66K Miles
1988 300SE Totaled in 1998, hit by drunk driver, but we walked away OK
1989 420SEL 140,000, just warming up. Total by 18 wheel gas truck rear ended, but refused to lose another MB. Had it repaired cost $10,000+ Great Car again SOLD it for a 2003 C320 to save on gas
1991 2500 Suburban 454, 130,000, Best truck in the world. SOLD it out right.
1952 8N Tractor 1,000,000-/+