I have a 1965 Plymouth big block that I restored 12 years ago. I have always used the green antifreeze in it but I am going to install an aluminum radiator. What type of antifreeze should I use? I know Honda and Toyota have their own blend that is supposed to be good for their aluminum engines. Should I be switching to one of those or stick with the green stuff.
Bob Maio
All antifreeze sold today is suitable for aluminum. (Years ago that was not the case which is part of the reason why aluminum engines didn't fare well when made available in some American cars in the early 1960s.)
You can use pretty much any coolant you want to if you first flush out all of the old stuff.
I've used both the old green stuff, and the long-life stuff in aluminum radiators, and I've never noticed a huge difference.
You might as well use the long-life stuff.
Whatever is on sale.
