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If you don't buy a heavy duty "conventional" coolant you're supposed to add SCA on the initial fill and again every 300 hours or so with a change at 3000 hours Conventional coolants are available to purchase through Caterpillar but not many other sellers even have it. Heavy duty ELC coolants...

Something to keep in mind, whatever antifreeze formulation you use, they cannot protect dirty metal. The corrosion inhibitors are film forming additives that react with the metals to produce the protective films. Rust and other dirt will prevent the formation of protective film and the corrosion...

The 53009 extended is meant to be used with 46153 coolants. Do not use it with other coolants. Due to the age of the 46153 standard, it's likely a sodium nitrite inhibited coolant. You cannot buy these at auto parts stores anymore. All auto parts stores sell carboxylic acid inhibited coolants...