[updraught]

Penrite did have a good blurb on this, but they seem to have removed most of it. Too scary I guess.

https://www.penriteoil.com.au/knowle...coolants/395#/
https://www.penriteoil.com.au/knowle...hibitors/289#/
https://www.penriteoil.com.au/knowle...position/287#/
Their Classic Car Coolant can be used with water, or added to coolant to beef up the corrosion inhibitors:
https://www.penriteoil.com.au/applic...-car-coolant#/


I'll let Scotty explain the basics:
https://www.youtube.com/watch?v=qYX4kRaOvTM