What Causes Oil on the Spark Plugs of the Teana?
2 Answers
The reasons for oil leakage on the spark plugs of the Teana are as follows: 1. Aging of the valve cover gasket: The valve cover gasket is usually made of rubber, and hardening over time is inevitable. Since the function of the valve cover gasket is to seal and prevent oil leakage, the criteria for judgment are visible oil seepage, abnormal oil consumption, or oil on individual spark plugs. The solution is simple—just replace the valve cover gasket. 2. Aging of the spark plug seal ring: Spark plugs also have a seal ring, which in some models is designed to be integrated with the valve cover gasket. The criterion for judgment is the presence of oil residue on the spark plug threads. Like the valve cover gasket, replacing the spark plug seal ring can solve the problem of oil on the spark plugs. 3. Oil blow-by: There are many factors that can cause this, such as excessive gap due to piston ring wear, excessive gap between the valve stem and guide, etc. The criterion for judgment is oil on all spark plugs. This issue is not easy to solve on your own, so it is recommended to leave it to a professional mechanic.
When I was driving the Altima and encountered oil on the spark plugs, this issue often stems from aging or damage to the valve cover gasket. After the seal loses its elasticity, oil leaks into the spark plug wells, soaking the spark plugs and causing ignition failure. I once ignored it, resulting in engine shaking and increased fuel consumption, but everything returned to normal after replacing the gasket. Oil leakage can also occur due to cracked ignition coil seals, a blocked ventilation system, or worn piston rings allowing oil to enter the combustion chamber. It's advisable not to delay and to regularly inspect engine seals to prevent more expensive repairs, such as damaged spark plugs or catalytic converters. If you notice any issues, have them addressed at a professional shop for safety and peace of mind.
