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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer this is very common when pouring the oil sometimes it is done with little care causing the oil to fall into the cylinders this will affect the coil and this is why it affects the spark affecting the ignition of the cylinder, but also when the valve cover gasket is damaged can cause exactly the same leakage of oil falling into the cylinder.