What are the grades of NGK spark plugs?

[StJulia]

NGK spark plugs are classified into nickel alloy spark plugs, platinum spark plugs, iridium spark plugs, iridium-platinum spark plugs, and double iridium spark plugs. The functions and precautions of spark plugs are as follows: Functions of spark plugs: The function of a spark plug is to introduce the high-voltage electricity generated by the ignition coil into the engine cylinder, creating a spark between the electrodes of the spark plug to ignite the air-fuel mixture. Precautions for using spark plugs: When disconnecting the high-voltage line connector, be gentle and avoid forcefully shaking the spark plug insulator, as this may damage the sealing performance of the spark plug. The spark plug should only be removed after the engine has cooled down. After loosening the spark plug to be removed, use a thin, soft tube to blow away any dirt around the spark plug to prevent dirt from falling into the combustion chamber when the spark plug is removed.

[SanJayla]

I've been using NGK spark plugs for several years myself, with the grades mainly divided into two categories: material and heat range. The basic copper-core ones are affordable but require frequent replacement; the upgraded platinum versions are more durable, ideal for frequent long-distance driving; the highest grade is iridium, offering quick ignition and fuel efficiency. Heat range is indicated by numbers, such as 5 to 10, where lower numbers suit older cars or cold weather to avoid overly cold starts, and higher numbers are for high-performance engines to prevent overheating. Choosing the wrong grade can lead to unstable idling or increased fuel consumption, so it's advisable to check the vehicle manual or test the spark plug electrode color before replacement. As a car enthusiast, I believe understanding these can extend the engine's lifespan by tens of thousands of kilometers, saving a lot on repair costs.

[DeGarrett]

From the perspective of heat range, the NGK spark plug grading is crucial, divided into levels 5-10. A smaller number indicates a conservative heat level, which is less prone to carbon buildup, while a larger number means faster heat dissipation, suitable for high-load driving. In terms of materials, copper plugs are adequate for regular use but wear out easily; platinum offers better corrosion resistance; iridium provides more precise ignition at the tip. Resistor types, such as laser-welded models, reduce electrical interference affecting the radio. I usually identify them through NGK codes, like BP5ES, where the 5 represents a medium heat range. Understanding these helps me fine-tune the engine for smoother performance during routine maintenance.

[LeWalker]

I think the essence of NGK spark plug grades is balancing cost and performance. The cheapest copper ones need replacement every 10,000 km; platinum ones cost a bit more but last up to 30,000 km; while iridium, though pricier, can endure 40,000 km. Choosing heat range 7-8 within the 5-10 spectrum offers the best value. Remember, incorrect heat range can increase engine fuel consumption by 10%, so don't skimp in the wrong place. Regularly check electrode gaps to ensure precise ignition—acceleration feels more direct after replacement.