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Installing a spark plug with the engine hot can change the torque specification. This video is sponsored by Autolite.
The torque specification for a spark plug is for when the engine is cold.
Installing a spark plug with the engine hot can change the torque specification and how the threads on the engine and spark plug interact. This can lead to a plug that is too loose or too tight depending on the application. In this video, Andrew Markel covers why you need to wait to install new spark plugs. This video is sponsored by Autolite.