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10 Best Spark Plugs 2025 in the United States

#1

Winner

10.0 score

NGK # 3186 G-Power Platinum Spark Plugs TR5GP - 8 PCSNEW

NGK # 3186 G-Power Platinum Spark Plugs TR5GP - 8 PCSNEW

NGK

10.0 score

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The NGK # 3186 G-Power Platinum Spark Plugs TR5GP is a robust choice for those looking for reliable performance in their vehicle’s ignition system. Made primarily from platinum, these spark plugs offer durability and longevity, making them a cost-effective option in the long run.

#2
10.0 score

ACDelco 41-962 Professional Platinum Spark Plug, (8)

19%OFF

ACDelco 41-962 Professional Platinum Spark Plug, (8)

ACDelco

10.0 score

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The ACDelco 41-962 Professional Platinum Spark Plug offers several strong features that make it a reliable choice for car owners looking for durable spark plugs. The one-piece, fired-in suppressor seal ensures a gas-tight seal, which helps to reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures. This leads to a longer lifespan of the spark plug. The double platinum point pad on the center and ground electrode enhances durability and ensures consistent voltage demands, reducing wear on the ignition system.

#3
9.9 score

NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack

NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack

NGK

9.9 score

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The NGK LKAR7BIX-11S Iridium IX Spark Plug is an excellent choice for performance enthusiasts looking to maximize their engine's potential. Made from high-quality iridium, this spark plug is designed to offer extreme ignitability and improved throttle response. Its 0.6 millimeter laser-welded fine tip ensures high durability and a consistently stable spark, making it ideal for high-performance engines. The tapered ground electrode helps minimize the electrical quenching effect, which further enhances performance and efficiency.

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Material
The Iridium IX construction ensures excellent ignition efficiency and longevity, leading to smoother acceleration and enhanced engine responsiveness.

Top 10 Best Spark Plugs 2025 in the United States

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Slide 1

MAS

MAS Ignition Coil DG508 & Motorcraft Spark Plug SP479 compatible with Ford 4.6L 5.4L V8 DG457 DG472 DG491 CROWN VICTORIA EXPEDITION F-150 F-250 MUSTANG LINCOLN MERCURY EXPLORER (Set of 8)

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#1

Winner

10.0 score

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NGK

NGK # 3186 G-Power Platinum Spark Plugs TR5GP - 8 PCSNEW

Material: Platinum
Thread Size and Reach: 14x1.25mm

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Chosen by 1145 this week

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Slide 1

MAS

MAS Ignition Coil DG508 & Motorcraft Spark Plug SP479 compatible with Ford 4.6L 5.4L V8 DG457 DG472 DG491 CROWN VICTORIA EXPEDITION F-150 F-250 MUSTANG LINCOLN MERCURY EXPLORER (Set of 8)

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#2

10.0 score

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ACDelco

ACDelco 41-962 Professional Platinum Spark Plug, (8)

Material: Nickel, Platinum, Copper
Thread Size and Reach: 14 millimeters

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19% OFF
#3

9.9 score

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NGK

NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack

Material: Iridium
Gap Size: 0.6 mm
Thread Size and Reach: M14 x 1.25

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#4

9.8 score

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NGK

NGK # 6509 Iridium Spark Plug LTR6IX-11 - 6 PCSNEW

Material: Iridium

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#5

9.6 score

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Newparts

NGK Set of 16 Iridium IX Spark Plugs For Chrysler Dodge Jeep Ram 5.7 6.4 V8

Material: Iridium
Heat Range: appropriate
Gap Size: preset
Thread Size and Reach: tailored to fit engine models
Resistor or Non-Resistor: Resistor

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#6

9.4 score

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AD Auto Parts

8 ACD-OEM Spark Plug Wires 9748HH + 8 ACD-OEM Double Platinum Spark Plugs 41-962 + 8 Heat Shields For LS2 LS3 LS4 LS7 Engines

Material: Metal, Copper
Thread Size and Reach: 14mm x 1.25mm

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#7

9.2 score

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ACDelco

R45ts Pkg 8

Material: Ceramic, Copper, Nickel-Chrome Alloy
Thread Size and Reach: 14

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17% OFF
#8

9.0 score

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NGK

6 New NGK Iridium IX Spark Plugs LFR5AIX-11 # 4469

Material: Iridium, Nickel

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#9

8.7 score

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ACDelco

ACDelco CR43TS 5614029 (05614029) Professional Conventional Spark Plug BOX OF 8

Material: Nickel, Copper
Thread Size and Reach: M14

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#10

8.5 score

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Bosch

BOSCH 9614 OE Fine Wire Double Iridium Spark Plug - Pack of 4

Material: Iridium
Gap Size: Pre-gapped
Thread Size and Reach: Nickel-plated threads

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8% OFF
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Buying Guide for the Best Spark Plugs

Choosing the right spark plugs for your vehicle is crucial for maintaining engine performance, fuel efficiency, and overall reliability. Spark plugs are responsible for igniting the air-fuel mixture in the engine's combustion chamber, which powers your vehicle. When selecting spark plugs, it's important to consider several key specifications to ensure compatibility and optimal performance. Understanding these specifications will help you make an informed decision and keep your engine running smoothly.
MaterialSpark plugs are made from different materials, including copper, platinum, and iridium. The material affects the spark plug's durability and performance. Copper spark plugs are affordable and provide good performance but have a shorter lifespan. Platinum spark plugs last longer and offer better performance than copper. Iridium spark plugs are the most durable and provide the best performance, making them ideal for high-performance engines. Choose the material based on your vehicle's requirements and your driving habits.
Heat RangeThe heat range of a spark plug indicates its ability to dissipate heat from the combustion chamber. A spark plug that is too hot can cause pre-ignition and engine knocking, while one that is too cold can lead to fouling and poor performance. Heat ranges are typically indicated by a number, with lower numbers representing hotter plugs and higher numbers representing colder plugs. Consult your vehicle's manual or a professional mechanic to determine the appropriate heat range for your engine.
Gap SizeThe gap size is the distance between the center and ground electrodes of the spark plug. This gap affects the spark plug's ability to ignite the air-fuel mixture. A gap that is too small can result in weak sparks and poor combustion, while a gap that is too large can cause misfires. Most vehicles have a recommended gap size specified in the owner's manual. It's important to check and adjust the gap size to match your vehicle's specifications for optimal performance.
Thread Size and ReachThread size and reach refer to the diameter and length of the spark plug's threaded portion. These dimensions must match the engine's cylinder head to ensure proper fit and function. Using the wrong thread size or reach can cause damage to the engine or result in poor performance. Always refer to your vehicle's manual or consult a professional to ensure you select spark plugs with the correct thread size and reach for your engine.
Resistor or Non-ResistorSpark plugs can be either resistor or non-resistor types. Resistor spark plugs have an internal resistor that helps reduce electromagnetic interference (EMI) with electronic components in modern vehicles. Non-resistor spark plugs do not have this feature and are typically used in older vehicles or specific high-performance applications. If your vehicle has electronic systems that could be affected by EMI, it's best to choose resistor spark plugs.

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