I have a 2005 XF w/about 70K. I need to know how much Transmission Fluid should normally be in the pan when changing filter only. I've had the car since 2007 (bought used w/20K) I had not changed or checked ATF/filter. Drained the oil. Measured and had not quite 3 qts in pan. I know there should be 8 qts total, but since not all drains, I'm wondering "how low" can I guestimate I was with the 3>qts that came out?

I will probably end up buying a dipstick to be accurate, but in these tough economic times, any input/advice would be helpful