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I used Havoline Extended Life Coolant for my refill.
There site says its EG and rated for HD diesel use but no mention of if it needs SCA added and cant find a link to ask them on the web page.
It's Red not green or gold like most.
Anyone Know if it needs the SCA ??
Texaco Extended Life Coolant/Anti-Freeze is manufactured from ethylene glycol and a highly effective, extended life corrosion inhibitor package. This inhibitor system eliminates the need for silicates, phosphates, borate's, nitrates, and amine additives traditionally used for this purpose.