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ok, basically as a diesel runs the coolant surrounding the cylinders get "blown" away from the cylinders due to the vibration from the power stroke. A vacumn is created directly around the wall causing the coolant to violently slam back into the cylinder wall breking small bits off. After tiime it can eat through the wall if fact somewhere on this site are pictures of just that, the pinholes. As I was told SCAs or DCAs provide a sacrifical surface to be damaged rather than the metal, or if you can afford it Evans coolant wich will not be "blown" back in the first place negating the need for scas or dcas. As the scas are consumed they get weak and flake the flakes can get into the water pump seals or other places and do damage. I'm still in the process of learning this myself so I made it a point to find the test strips from Wix and test and adjust my levels and install a filter just to be safe. If I'm wrong please someone correct me
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1992 F-350 7.3 IDI Non-Turbo 4door LWB Dually
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