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Technician a says that if the exhaust has a bluish tint, it indicates that engine is burning coolant. Tech b says that blackish exhaust indicates a rich fuel mixture

User Mike Glenn
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im sorry but the first half is incorrect bro if your exhaust is a bluish tint it means your burning oil and its coming in the form of blowby in worn piston rings or oil seaping through the heads from the valves due to a blown head gasket or cracked cylinder head or block

User Bryce Howitson
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