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I would not use stop leak in anything.
A blown head gasket can mean a lot of things. The big thing to know is that both oil and coolant flow across that joint.
So it could be a mild as a little bit of oil leakage and low compression on one cylinder.
It could be: We didn't know coolant was leaking internally into the oil and we just kept topping off the coolant. We drove it until the engine oil was so diluted that every bearing service in the engine is destroyed and the engine seized.
It could be: We didn't know coolant was leaking internally into the engine and burning. We kept driving until the engine overheated and cracked the block.
So it could be as simple as changing the head gasket (which if I remember correctly you turned into a year-long project on your Civic) or it could be a replacement engine.
You won't know until you go look and do some investigating.
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