What is “Black Oil” or “Black Death”? if your auto AC system gets Black Death, it becomes infected just like the plague. Black Death develops inside the compressor of a vehicle’s air conditioning system if the refrigerant breaks down. From here, the grimy and sharp particles created during the breakdown infect the rest of the air conditioning system, wreaking complete havoc. Before you know it, all airflow has gone. Enter the auto AC grim reaper! The best way to protect your car from Black Death

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