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Spark plugs are one of the most important components of internal combustion engine (ICE) cars. They are located in the cylinder head and provide a spark of electricity that ignites the air and fuel mixture and powers the vehicle. Just like most other car parts, they will need to be replaced over time. You can visit a mechanic or dealership service center to have them replaced or, to save money, you could buy them online, or from your favorite brick-and-mortar car parts store, and replace them yourself. Here are the best spark plugs currently available at Amazon — prices will vary depending on the make, model, and year of your vehicle.
Autolite Iridium XP Automotive Replacement Spark Plugs (pack of 4) - $24.02 (32% off)
Key Features
- Pack of 4
- Lasts up to 100,000 miles
- Iridium-enhanced center electrode
- Platinum-protected ground wire
- Helps fuel economy
This Autolite Iridium XP Automotive Replacement Spark Plug is extremely durable and can last up to 100,000 miles. It’s able to reach this longevity with its iridium-enhanced center electrode and platinum-protected ground wire for maximum efficiency. The nickel-plated shell resists corrosion and prolongs the lifespan of the spark plugs.
NGK Spark Plugs 7090 BKR5EGP G-Power Spark Plug (pack of 4) - $14.99 (5% off)
Key Features
- Pack of 4
- Platinum center electrode
- Nickel alloy core ground electrode
- Lasts up to 40,000 miles
This NGK Spark Plug comes in a pack of 4 and is a good value. It features a trapezoid-cut ground electrode that reduces quenching. This spark plug will last you up to 40,000 miles.
Bosch 9697 Double Iridium OE Replacement Spark Plug - $10.29 (18% off)
Key Features
- Double iridium firing pin
- 360 degrees continuous laser
- Copper core ground electrode
- OE fine wire design
- Lasts for up to 7 years
The Bosch 9679 Double Iridium OE Replacement Spark Plug contains a double iridium firing pin and ground electrode that can last up to 7 years. The 360-degree continuous laser weld will fuse the corrosion-resistant firing pin to the base to extend the service life. The core is made from copper and provides better heat transfer.
Champion Copper Plus 71G Spark Plug RC12YC (pack of 4) - $8.56 (27% off)
Key Features
- Copper core electrode
- Inhibits corrosion
- Built to ISO and SAE standards
This Champion Copper Plus 71 Spark Plug has a copper core electrode that provides extra heat control and increases conductivity. It’s also built to meet the standards of the International Organization for Standardization (IOS) and the Society of Automotive Engineers (SAE) for its great performance.
DENSO #4504 PLATINUM T T Spark Plugs (pack of 6) - $21.42
Key Features
- Pack of 6
- Twin-tip design
- Platinum alloy center electrode
- Titanium-enhanced ground electrode
- Great ignitability
This DENSO Platinum TT Spark Plug six-pack has a twin-tip design made with platinum and titanium. The titanium-enhanced alloy that the ground electrode is made with will increase durability and minimize tip erosion. The great ignitability of this spark plug will deliver efficient combustion, leading to better engine performance and improved gas mileage.
What are the benefits of new spark plugs?
They can provide better fuel efficiency, reduce emissions, make proper combustion and help the car start smoothly.
How do I know if my spark plugs are bad?
There are a few signs that your plugs need to be replaced. The most common are issues starting the car, rough idling, sluggish acceleration, bad fuel economy, engine knocking and misfires.
How often should spark plugs be changed?
The change intervals of spark plugs can vary depending on the plugs. According to Mansfield Motor Group, “Ordinary copper and nickel spark plugs should be changed every 30,000 to 50,000 miles, unless otherwise suggested by the spark plug manufacturer. Platinum and iridium spark plugs tend to last longer than standard copper and nickel spark plugs. Expect to change them every 60,000 to 150,000 miles unless otherwise noted.”
Are spark plugs easy to change?
Spark plugs can be installed yourself and the process isn't too challenging. Here is our tutorial on how to install spark plugs yourself.
Can spark plugs be used in ICE other vehicles?
Yes, spark plugs are used on other internal combustion vehicles: motorcycles, ATVs, snowmobiles, boats, lawn mowers and chainsaws.
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