best antifreeze for old cars

That's one part of a 5-part article I wrote about cooling systems. There are links to previous/next chapter at the bottom of each part. Unfortunately, I cannot give permission, as I am not the copyright holder. I wrote that for Allpar before that site's founder sold the site to a media company I have a very dim opinion of, called VerticalScope, who turned Allpar into a zombie undead shell of its former self.