30 closed cab, I've not done a thorough study either, but have read a little on the subject. Model A Times did an article on it a few years back, and found no reason to not use it. I recommend either it (or similar) or 50/50 anti-freeze in my heads because of it's compatibility with aluminum.
I think all regular anti-freeze's are compatible with aluminum. Some new cars have aluminum radiators, probably as much as weight saving as anything, but aluminum does transfer heat better than other materials.
It appears that, like many postings, not much has been solved! Model A er's are a hard-headed bunch, including me! -
