It's that time again...different vehicle (now a 1991 300ce) lost the prior car in a accident. So time to refresh the coolant!

A link which appears to complement the above reference may be found here: http://www.underhoodservice.com/Article/39651/correcting_coolant_confusion.aspx
A partial cut and paste is below...
Extended Life Hybrid Coolants
Silicated Hybrid Organic Acid Technology (HOAT) antifreezes, which are sometimes referred to as “G-05” formula coolants, contain organic acids in combination with one or more inorganic inhibitors. The most common inhibitor is silicate. The addition of silicates increases corrosion protection for aluminum engines, radiators and heater cores, and helps protect the water pump against erosion wear. Silicated hybrid OAT coolants are specified for 2001 and up DaimlerChrysler vehicles, 2002 and up Ford trucks and SUVs, 2003 and up Ford passenger cars, and 1985 and up Mercedes, BMWs, Volvos and Mini Coopers. “Phosphated HOAT” coolants are used in Asian vehicles (Toyota, Honda, Nissan, Kia and Hyundai) because Asian vehicle manufacturers prefer phosphated organic acid coolants and do not like silicated organic acid coolants. European vehicle manufacturers, on the other hand, generally specify silicated HOAT coolants and do not like phosphated organic acid coolants. That’s why some antifreeze suppliers offer different HOAT formulas for these applications.

My thoughts: Distilled water and a G05 mixture appears to be an acceptable anti-freeze for those folks who live in a "hard water" region.

ron_of_orange
7/28/2009