Hello: Answer your questions one by one 1. If the high-voltage line has been deformed or failed due to oil bubbles, it should be replaced. If the soaking time is not long, the high-voltage line can still be used. 2. If the valve cover gasket replaced by your vehicle is still under warranty, you can find a 4s shop to replace it. In general, if the valve cover is not deformed, it does not need to be replaced. 3. If there is too much oil leakage, the engine oil will accumulate in the accessories of the spark plug, resulting in poor heat dissipation of the spark plug and affecting the work.
I hope the above answers are helpful to you, thank you!
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