the coorect levels are the actual lines in the stick near the bottom the bends are normal but not used for measuring. to check the level get the car to operating temperature around 80 degrees centigrade. Then with the car on a level surface with engin runing pull the stick clean it put it back in give it a couple of seconds and pull it again the level between the lines is what you look for. sometimes it is hard to read but look carefully you will see a oil marking.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)