During its useful service life, silicates exist in the coolant at the molecular level. Peak traditional can be found at Rite-Aid drug stores. In my neck of the woods, the only place you can find Zerex G-05 is at Pep Boys. Where I live, Prestone has the market almost to themselves. Unfortunately, in the real world, choice of antifreeze is not so easy. Valvoline/Zerex 578-3 is another very good formulation, but almost impossible to find in retail outlets. It is an excellent coolant with ASTM test results which are highly competitive with the best traditional formulations. When it comes to the newer coolants, one the best rivals for the above brands is probably Zerex G-05. It's close to traditional formulation but not quite.Ī good traditional green coolant when properly maintained is equal to the newer formulations in corrosion protection, perhaps better in some cases. All of these contain silicates and phosphates which are good news for aluminum.Ī step down from the above mentioned is Texaco which loses marks for failure to contain phosphates. I suspect that the TSC Traveller might even be made by Peak. They know it's good stuff.Īutozone "Valucraft", Pep Boy's "ProLine", and Tractor Supply Company's "Traveller" are also very good. And Peak takes its traditional line seriously and unapologetically. Peak holds some fine patents on the formulation of traditional antifreeze, with ASTM test results to support their claims. The very best of the traditionals is probably Peak (regular formula, not to be confused with Peak long life). I've researched the subject quite a bit, studied ASTM test results, MSDS sheets, and patents for traditional antifreeze. But remember to change it out every 18 to 24 months. It is loaded with aluminum friendly phosphates and silicates. Valucraft is a very good traditional green coolant.
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