Spark plugs are essential components in petrol engines, responsible for igniting the air and fuel mixture that powers your vehicle. Choosing the right spark plug helps ensure smooth starts, efficient combustion and reliable performance across a wide range of driving conditions. At Supercheap Auto, our spark plug range includes quality options from trusted brands, making it easier for you to find the correct plug for your vehicle, driving style and maintenance needs.
What is a spark plug, and why does it matter?
A spark plug is the component that creates the spark needed to ignite the air and fuel mixture in your engine, allowing the vehicle to start and run. Installed in the cylinder head, it fires at precisely the right time to trigger combustion in each cylinder. Properly functioning spark plugs support smooth acceleration, reliable starting, efficient fuel use and lower emissions, while the correct spark plug for your vehicle helps maintain consistent performance and engine reliability.
Signs your spark plugs might need replacement
Signs your spark plugs might need replacement include hard starting, rough or uneven idling, engine misfires, sluggish acceleration, reduced fuel efficiency, or a check engine light appearing on the dashboard. You may also notice increased fuel consumption or a lack of power under load. Replacing spark plugs at the manufacturer-recommended service interval helps restore smooth engine performance, improve efficiency, and prevent further ignition or drivability issues.
How to choose the right spark plugs?
Selecting the right spark plugs starts with knowing your vehicle’s make, model and year, as well as the engine type and driving conditions. Key factors to consider include the correct heat range, electrode design, material type (such as copper, platinum or iridium) and thread size. Heat range affects how quickly the spark plug dissipates heat, which can impact performance and longevity. Iridium and platinum spark plugs often offer longer life and stronger spark compared with standard copper plugs.
Quality spark plugs from trusted brands
At Supercheap Auto, we offer spark plugs from trusted brands designed to suit a wide range of vehicles and driving needs. Our range includes NGK, Autolite, Denso and more, each known for reliable ignition, consistent performance and long service life. NGK is trusted for everyday and performance vehicles, Autolite offers dependable value for daily driving, and Denso delivers precision-engineered spark plugs for smooth combustion and reliable starts. With different materials, heat ranges and designs available, it’s easy to find the right spark plug.
Durable iridium spark plugs for modern vehicles
We also offer a range of iridium spark plugs, which are ideal for modern vehicles, offering long life and reliable ignition. The fine iridium tip needs less voltage to fire, producing a strong, consistent spark that improves cold starts, throttle response and fuel efficiency. As these resist wear better than standard copper plugs, iridium plugs last longer and require less maintenance, making it a smart choice for everyday driving, commuting and long-distance trips.
Shop spark plugs at Supercheap Auto
Spark plugs play a vital role in your vehicle’s performance and efficiency. Choosing the right spark plug and keeping up with regular replacement can improve starting, fuel use, throttle response and overall engine health. With a wide range of options from trusted brands like NGK, Autolite and Denso, we make it simple to find quality spark plugs that suit your vehicle, driving needs and budget. Shop online or in store to keep your engine firing on all cylinders.
Frequently Asked Questions - Spark Plugs
Which types of vehicles use spark plugs?
Spark plugs are used in most petrol engines, including cars, motorcycles, trucks, boats, and small engines like scooters, ATVs, and lawn equipment. Diesel engines typically do not use spark plugs, as these rely on compression ignition instead. Using the correct spark plug for each petrol engine ensures reliable starting, smooth running, and optimal fuel efficiency.
How often should spark plugs be replaced?
Spark plug replacement depends on the plug type, and your vehicle’s manufacturer recommendations. As a general guide, standard copper plugs typically last around 20,000-40,000 km, while platinum plugs can last up to 100,000km, and iridium plugs up to 60,000-100,000km, depending on the type. It’s best to refer to your vehicle’s owner’s manual for the recommended service intervals, and keep an eye out for any signs that a replacement may be due.
Should I replace all spark plugs at once or just one?
It’s best to replace all spark plugs at the same time, rather than just one. Spark plugs wear gradually, and installing a new plug alongside old ones can cause uneven performance, misfires, or rough idling. Replacing the full set ensures consistent ignition, smoother engine operation, and better fuel efficiency. This is especially important for modern engines, where advanced timing and fuel management rely on all plugs performing evenly.
How many spark plugs does a vehicle use?
The number of spark plugs depends on your engine type. Most cars have one spark plug per cylinder, so a 4-cylinder engine has 4 plugs, a 6-cylinder has 6, and an 8-cylinder has 8. Some modern engines use dual spark plugs per cylinder for better combustion, which doubles the total. Always check your vehicle’s manual to understand the correct number for your engine.
Which spark plugs will fit my vehicle?
The right spark plugs depend on your vehicle’s make, model, year, and engine type. To make it simple, check your vehicle’s manual for the recommended specifications, or simply enter your car rego into our ‘My Garage’ tool to see which spark plugs are compatible with your vehicle.
What’s the difference between copper, platinum, and iridium spark plugs?
Copper spark plugs are affordable and good for older engines but typically wear faster. Platinum plugs last longer and provide a stronger spark, while iridium plugs offer the best durability, precise ignition, and improved performance, especially in modern engines with advanced management systems.
