[68c10airstream]

Look up the article "coolant confusion" by motor age magazine. it goes into detail all styles of coolant. As a dealer mechanic of 30 plus years what i noted was dexcool in a system that had what i call a burp bottle for an overflow (non-pressurized) bottle got what i called hoatmeal inside it. The same engine with a pressurized overflow bottle that had a screw on pressure cap didn't have the condition. I'm using G-05 antifreeze in my ls 5.3 (2001 vintage). It's been 3 years with the original brass heater core, 2001 aluminum radiator (from the organ donor) and no issues. Coolant still looks great with no sediment, or discoloration.