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Talk about replacing or checking the spark plug yourself.

At present, 46,700 kilometers, the spark plug has been changed twice. When replacing the original car for the first time, there was no oil on the thread of the spark plug. For the second time, the torch spark plug is the same as the original factory. There is oil on the thread when replacing. But not much. I changed it in a 4s shop. I have no reason to doubt that I didn't tighten the spark plug when I changed it.