The popularity of spark plug brands can vary depending on the region, car make/model, and preferences of motorists. In this review, we’ll try to help you choose the best spark plugs for your car based on quality, life, price, and reliability. Here are some popular brands that are often mentioned by our experts based on sales statistics and feedback from customers and service stations:

NGK: Japanese manufacturer, is one of the most famous and popular brands of spark plugs, providing a wide range of parts for different cars.
Denso: another Japanese brand that produces high-quality spark plugs and is popular with many car enthusiasts.
Bosch: The German manufacturer is also known for its automotive components.
Champion: American manufacturer of ignition parts for various car brands.
Beru: a German brand that specializes in ignition systems, but glow plugs from this manufacturer are more popular.

Top 5 glow plugs (glow plugs for diesel)

Beru: one of the world leaders in the production of glow plugs for diesel engines.
NGK: also known for its high quality electrical parts.
Bosch: provides glow plugs for diesel engines and is a widely recognized brand.
Denso: also produces electrical parts for various cars, especially for Japanese and Korean brands.
Champion: this brand also produces glow plugs for diesel engines.

Signs of engine spark plug failure

Poor engine starting (if the engine starts poorly or with difficulty, it may be a sign of worn or dirty spark plugs).
Unstable idling (if the engine idles erratically, it may indicate a spark plug problem).
Loss of power (worn and coked spark plugs can lead to power loss and poor engine performance).
Unstable engine operation (the engine may shudder or run rough while driving).

Spark plug and glow plug life

The average spark plug life in thousands of kilometers for a gasoline engine car may vary depending on the manufacturer, design, material parameters, and operating conditions. Typically, spark plugs can last approximately 30,000 to 50,000 kilometers, but this can vary.

The average service life of glow plugs in diesel engines can also vary due to the reasons listed above and can be approximately 100,000 – 150,000 kilometers, but this also depends on the operating conditions and the type of spare parts.