Philaguyen,

I noticed the same thing on the oil guage, when I went to take delivery of my 420 from my nephew. Not being a DIY'er he always had others service his MB. The neadle was at 3 bars, always and at stop, didn't matter. I thought to myself there should be some drop in it at stop in gear at idle. Still 3 bars, you guessed it, a quart to much oil, which I drained out the next day, before putting it on the road home. Now it drops to 2 bars at idle in gear, and the oil level likes to stay midway of the min and max lines on the stick. Make sure your not overfull.

Keith

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1989 420SEL 105575 miles
Pearl Black/Grey

1990 Chevrolet E-Cab C-1500
293,000 miles

1989 Olds Toranado Trofeo'
132,000 miles