coolant capacity

[Rockettvr]

Morning all
Any ideas on how much coolant is in a 350i ??
After changing my head gaskets I now need to refill the cooling system with antifreeze - rather than trying to totally empty the system to refill thought Id just partially drain the system put in the required amount of antifreeze to give a 50:50 mix and top up with water
Thanks all
Ron

[Rockettvr]

Cheers Zig
If I put in the 5 ltrs of concentrated antifreeze I've got it should give me just under a 50:50 mix then