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It detected a head gasket leak on my 05' F250 diesel with 225k miles on it (trace amounts of coolant in the oil). Saved my block/heads from any real damage. I might have not know it had an issue until I was towing something out in the middle of nowhere and had the motor overheat and lock up.
I was able to pull the heads off and replace the gaskets.
It was worth $25 to me......
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