Zerex HD is specially formulated for diesel engines, not all antifreeze is the same.
Diesels need certain additives that gasers do not need. So be shure the coolant ur useing is the right one for diesels.
For example... Friend of a friend was running regular green coolant in his 7.3, and it ended up eating a hole in one of the cylinder walls. I wish I could find the write up I read at one point, but basically, due to the nature of the beast, microscopic air bubbles are formed during operation and the engine, and believe it or not, these microscopic air bubbles eat metal over time. Diesel coolant has additives to combat this. Anybody correct me if I'm wrong or point to where I read this if you know what I'm talking about.
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