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Message: [QUOTE="FirstSixOh, post: 204097, member: 3412"] I flushed 10 times, using 33 gallons of distilled water. The engine was run and the heater turned on each time. It drained clear after 9 flushes, but I did one wore to be certain. Casting sand is heavy, and it accumulates in places in the engine that are largely unaffected by circulation. It takes the jostle of driving a couple of thousand miles to move this sand into suspension so it can be filtered. How is heavy sand lifted from the bottom of the engine to the filter which is near the top? It's pretty much undeniable that casting sand was present in my engine after 220,000 miles and 4600 hours. The filter caught some, and regular filter changes will catch more. What is this grit doing to your water pump? [/QUOTE]

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