Many car owners hear shop assistants saying, for example, "spark plugs need to be replaced after driving 30,000 kilometers, which can make the car more powered and save energy and fuel." Is this true? How often does the spark plug need to be replaced? Is it necessary to listen to the opinions of the shop assistants?

To know the answer, we should first know what kind of role spark plugs can play. We should know that the spark plug is an important component of the ignition system of a gasoline engine. It plays a role in igniting the combustible mixture. Therefore, it can be said that the spark plug will directly affect the entire engine. However, when it is necessary to replace the spark plug, several factors need to be analyzed in detail.

1. The Material of the Spark Plug

For example, nickel alloy spark plugs need to be replaced at 20,000-30,000 kilometers. The nickel-yttrium alloy spark plug is about 30,000 kilometers, the single platinum spark plug is about 40,000 kilometers, and the double platinum spark plug is about 60,000 kilometers. The iridium spark plug is about 80,000 kilometers, and the highest is the platinum-iridium alloy spark plug, which can be replaced at nearly 100,000 kilometers. However, ordinary private cars use nickel alloy spark plugs. 

2. Personal Driving Habits and Road Conditions

In particular, many car owners with manual transmission prefer low-speed driving. They believe that low-speed driving can reduce fuel consumption. In fact, there is no scientific basis for this. On the contrary, driving at low speeds can easily damage the car's engine. In turn, it will damage the life of the spark plug. In addition, if you often drive on congested roads, need to brake frequently and idle in situ, the spark plug will be damaged. 

3. The Type of the Engine

The type of engine is one of the important reasons that determine the spark plug replacement cycle. For example, the working conditions inside the cylinder of a turbocharged engine will be worse, so the oxidation speed will be accelerated. Therefore, the life of the spark plug will be shortened. 

However, the above are all in theory. Whether the spark plug needs to be replaced or not depends on the use of the spark plug itself. We can replace it according to whether the color changes, the gap between the electrodes, or whether there is a problem between the magnet and the metal shell. These situations can be known only by disassembling the spark plugs. If you are not a professional, it is recommended to judge by the operation of the car. For example, when driving, whether there is a noticeable feeling of pause, or the speed is getting slower and slower, etc. That may be due to the need to replace the spark plug.

So, "does the spark plug need to be replaced after driving 30,000 kilometers?" You should know the answer to this question. It needs to be dealt with in specific situations. You can judge yourself according to the operation of the car first. If you cannot judge, you should consult 4S stores.