Capacity of cooling system for 3.0 L engine?

What is your question?

After new water pump installed, coolant resevoir needed several fillings to avoid "Coolant Level Low" warnings. Is 2 gallons/ 7 liters required? Thank you.

What makes this problem better or worse?

Need to add coolant and no apparent leaks.

How long has your 2013 Jaguar XJ had this problem?

Several days after new water pump installed.