The main parts from where the V6 leaks are
The thermostat, the thermostat, the thermostat and- er well, the thermostat!
Then there is:
Waterpump, look around the pulley
Inlet manifolds, look at outer spark plugs, hesitation on start, wet on corners
Two metal pipes, always in the bends, check carefully, starts with
tiny holes!
Expansion cap, difficult to see.
Any leaks, usually plastic part or edge of radiator where aluminium bonds with plastic
Oil cooler,
just a matter of time, inside or outside, check for mayo under oil filler cap for inside leaks.
Cracks in expansion box.
And there might well be others, that I have forgotten!