Comments from other members and specific help from Gilly solved this probem.
I found that it is necessary to push the dash button in twice in rapid succession, in order to get the oil level reading. If you hesitiate very long between the two pushes, the reading does not appear. BlueEagle289

__________________
Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)