Also the debate between Blue and pink/red coolant. . .
Pink/red, has a surface tension reducer added to it, which for air release and metal surface cooling it's fantastic, because you have less/no (if possible) liquid surface tension you dont get air pockets, if you mix hot metal with air and water you get cavitation, the cavitation causes a tiny bead blast effect over a long time, the anti corrosion agents in blue coolant have to work twice as hard, that's why it wears out/contaminates faster hence needing changed more often,
So why not use Red/pink in pre90's cars?
The reason is the tolerances are bigger, water pumps/rads/hoses car leak also if you have a head gasket on the edge it'll make that worse and possibly finish it off.
So Red/pink is better . . but you take the chance.