Wondering what you're flushing out? Is it seriously rusted, as in red soup? Or do you just want to get all the old antifreeze out?
Never been a big fan of any flush other than water.
If it's rusty, using just about any thing other than water will likely start a radiator or freeze plug leak.
How did the freeze plug look that came out? Was there a layer of sludge inside the block? If it's that bad, now might be a good time to replace all the freeze plugs and try to get the sludge out if practical, then flush it with water.
If you're just doing a routine antifreeze change and it's not rusty, I would just flush it with water with the engine running and the radiator and block drains open. If there is a heater hose or bypass hose, take it loose so the block will flush since the thermostat will be closed.
Drain best you can, fill with 50/50 distilled water & antifreeze.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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