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The OEMTOOLS 25739 Combustion Leak Detector Fluid is designed for use with the OEMTOOLS 27145 Combustion Leak Detector (not included). Fluid will turn yellow if exhaust gases are found to be present in the cooling system. Not for use with diesel engines.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGs.ca.gov^