2000 XK8 5 speed Transmission

When servicing the transmission (draining the oil, dropping the pan, replacing the filter) how many qts will it take to obtain the original fluid level?
I'll keep track on how much comes out when I do the service, just need to know how many qts to buy.

 

I would have 6 qts on hand. It only requires 4-5, but it's not difficult to lose some the first time you do this. You can always return the unopened one.