Zerex G05 meets the MB spec and is essentially the same as MB coolant you can buy from MB dealers. It is known as a "hybrid". The corrosion inhibitor package is basically an organic formulation, but has a very small amount of inorganics.
Dexcool is a pure organic formulation.
All these anti-freeze blends are ethylene glycol based. The difference is in their corrosion inhibitor technology.
Both Teaxco (Havoline) and Prestone make a Dexcool formulation and this is indicated by the word "DEXCOOL" on the label.
If you can find Zerex G05, I would recommend that as a first choice and Dexcool as a second choice.
A 50/50 mix of antifreeze and water will provide maximum corrosion protection, freeze and boilover protection. Though potable drinking water is acceptable to mix with antifreeze, I always use distilled water to avoid introducing even very small quantities of disolved salts, which are present in all drinking water.
Last edited by Duke2.6; 08-31-2003 at 11:52 AM.