What happened to the spark plug of Jetta Laohu?

Hello, Jetta Laohu spark plug. That is to say, there is always carbon deposit on the spark plug. The reasons are as follows: First, the engine burns oil. Causing carbon deposition in the spark plug. Second, the spark plug, cylinder pipeline and ignition coil are aging, and the leakage resistance is too large. Lead to weak ignition ability, which will cause carbon deposition in the spark plug. Third, the spark plug model is wrong. If the calorific value model is wrong. It will also cause poor ignition ability. Make the spark plug produce carbon deposit. Fourth, poor fuel quality can also cause carbon deposition in spark plugs. I hope it helps you. If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.