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Why did the car dump the coolant on the road in the first place? Was the source of the leak identified? Is it possible that the oil and coolat are still mixing up, hence the unsuccessful flushes?
If nothing works out I'd use something that mixes both with oil and water, like ethanol. If you wanna go crazy you can modify a factory oil pump and circulate the mixture in the engine without rotating anything else in the engine to prevent bearing failure. But I think several flush cycles with cheap engine oil should do it, too. And pull the sump for ckeaning, as suggested. I definitely wouldn't just replace the engine as they suggested, lol.
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