Bob I determine where the level is as follows:
Drive the car at least 20 miles, park on a level surface and put the car in park. Pull the dipstick out and wipe off the fluid. Put the dipstick back in and pull it out. When I pull it out I look at it in really bright light and kinda/sorta turn it on edge where I can see where the first indication of it being all the way accross the dipstick is at - this is, what I consider, to be the level. You should be able to see where the "streaking" ends and the "all the way accross" part starts. I also make sure I look at both sides and go with the lowest side.