I have a 1984 280SEL europeon model (here in California if that makes a big change haha). I run the engine to normal operating temp on level ground, then shut it off to check the oil level. It always shows low. I added a quart to satisfy the thirst and the next week it appeared to need more again. Then I check it after setting for an hour and it's over full. Do you need to sit at the gas station for an hour to get the proper level?
1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
1982 240D (Steak dinner for two)