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2026. 6. 30. 작업
Getting the best results sealing head gasket leak with Blue Devil
I figure I'll post my own answer to the question today since it's the end of my 60 day window to request a refund. After all the things I tried, considering the Blue Devil attempt a failure, and starting the process to request a refund, I finally had success; the seal has held for over a month now. What it took in the end was driving 4 hours at 70 mph on a cold day, where the temperature gauge on the dash stayed all the way down on "C" for the entire drive (made possible by the thermostat having been removed). At the end of the drive, I expected to need to refill the coolant, but only a small amount had been lost, and there was no pressure on the top radiator hose after the engine had cooled. My best guess for what happened is this: To seal, the product needs a temperature gradient at the point of the leak. This is supposed to be provided by adding the product to the system immediately after starting the engine, while it's still cold. But the leak only happened under high engine load.
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