Ford Flex spark plug set

Original spark plugs from Ford. The price listed is for the full set. Signs of spark plug damage: - Difficulty in starting the engine - Unusual vibrations during driving - Lack of acceleration - Increased fuel consumption - Abnormal exhaust emissions. When do we recommend changing the spark plugs? We recommend inspecting and changing the spark plugs every 30,000 to 50,000 kilometers, or according to the car manufacturer's recommendations. If any of the above signs of damage are noticed, it is preferable to consult a specialized technician to determine the need for replacement.