Not too sure about your 430 but my 300e has two quarts difference between the min. and max. marks on the dipstick. It's pretty easy to check. When changing oil, count the quarts it takes to get to the min (4) and max (6) marks. I also know from experience that the low oil light comes on when the level gets down to four quarts.
MBZ seems to have a pretty durable dipstick unlike some cars with a rubber plug that can be pushed in too far and cause a false reading.