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https://www.zoro.com/zerex-antifreeze-coolant-1-gal-rtu-zxpcru1/i/G0555703/ This Zerex does specify IAT “Application Offers protection against liner pitting and hard-water scale deposits in heavy-duty diesel engines. Proprietary inhibitor chemistry helps protect all cooling system metals...

https://www.napaonline.com/en/p/ZRXZXPCRU1?cid=paidsearch_shopping_dcoe_google&store=27554&campaign=GSC-Chemicals&campaign_id=6478876245&adgroup_id=115972171828&adtype=pla&gclsrc=aw.ds&gad_source=1 Thinking this would be good to go as well…

Miles has an online chat they could probably confirm IAT, OAT, or HOAT. No luck for me trying to chat on my phone…

This is 100% ethylene glycol, so you need to dilute it with distilled water, and I’m about 90% sure it is IAT due to it meeting all these pro OAT specs… “Hot Surface Aluminum protection requirements of ASTM test D4340 and Cummins Heavy Duty Low Silicate requirements, and is designed to meet the...

See if this link works… https://www.steelsoldiers.com/threads/adding-a-block-heater-and-coolant-filter-on-6cta-8-3.131589/ I posted pictures of my install on this thread, a little different than the OP’s install.

Sorry, thought I read you where adding it as well as the block heater, I’ll see if I can dig up a link to a thread. This is the coolant I used https://mileslubricants.com/product/show/miles_evercool_(multi_duty_green_antifreeze)_(5_gallon) maybe @87cr250r can confirm it’s old school, non-ELC...

Thats what SCA additives are supposed to be for, or buy precharged coolant, you can also get precharged filters that will help maintain your SCA levels. Just as many horror stories running ELC in these older engines. After reading both sides of the debate, I went with cheap green precharged...