Originally Posted by JimBlake

Drain/fill amount is really only good when the car is level - like on a lift. If you jack up one corner or the other, you can drain out more or less.

The important thing is the dipstick shows the correct amount when the car is sitting on it's wheels on flat ground.

Same with engine oil. I usually drain a little more than normal, because I rotate my tires while it's draining. Lifting up each corner around the car drains out a little more of the dirty oil, which I think is a good thing. Trust the dipstick when it's all done.