Since 1971 there have been any number of imports with aluminum heads and using "regular" antifreeze with no problems. Datsuns, Toyotas, and more have had no corrosion problems. So it isn't necessary to use a special antifreeze unless the manuffacturer wanted to go fancy, and those experiments haven't been that successful.

I'd go to Wal-Mart and buy Prestone's "all engines" stuff, it's from a reputable company and you can find it everywhere. Job done.

R.