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I have experienced an adverse reaction in my antifreeze coolant and am looking for help.
My new to me boat (Sept. 2016) developed an overheat on the exhaust hose. It turned out to be an exhaust elbow that was corroded. Caught it in time prior to turbo damage. As part of the work, the mechanic changed the antifreeze. The old antifreeze was green, but he put in Prestone Command Extended life (red). He did not flush, but did mix it with distilled water. I have run the engine about 70 hours since, but at low RPM (1400). It is a 6BTA Cummins (2002) 330 hp. I have not noticed any gunk (yet) in this engine.
Ten days ago, I changed the antifreeze in my Onan generator using the same procedure (from green to red). Yesterday, when I finally received my new rad cap, this is what I found inside the filler neck and on the rad cap. (See photo). The gennie has only been run about 10 minutes since the change. Prestone has told me (before the gen set coolant change) that their Command product is compatible with ANY (their capitals) antifreeze and ANY engine. Obviously not. How do I clean this out and what do I install next? Sorry, but the photos seemed to “invert” on their own when uploaded.
Thanks for your advice,
Tom
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