If your dealer is nice you can buy a dipstick from them. The hole you saw is the actual dipsstick tube used for sucking the oil out as well as measuring. Not sure why MB decided that we could not use a dipstick nor why they think we do not want or need one. Probably to force the average buyer to go to the dealer for oil changes after Maintainance is over. Myself, I am going to buy one so when I hit the old 50K mark and do my own oil changes I actually have a dipstick. I have had the display state that I need a quart of oil about 9000 miles after the oil change and I call the dealer and ***** that I have no dipstick and do not trust that damn computer to tell me my oil level. They said I am not the only one, I only add 1/2 quart when it says that and it goes away.

As for checking it electronically, you need to just turn the ignition to on and not start the engine, then wait about 60 seconds and make sure you are on the MFD menu that shows you the oil level, the menu set that starts out with mileage and as you go through the screens you see temp next, then service interval time, then the next is the oil level.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....