Hello, I need to flush my coolant =)

I have 98 A6 2.8 AHA engine, and factroy cd manual which is not DIY friendly. I searched the forum and found out that coolant capacity for that car is 6.4qt which is ~6.5 liters.

I got ~2.5 bottles of g12 (~7liters) should be enought right?

My doubt is, does that include draining the engine block??
I don't want to drive my bike to the dealership on sunday if I'm low on coolant %)))
thanks a lot.