Best Automotive Replacement Spark Plugs Under $100 (2026)
We ranked spark plugs under $100 by value score using brand reliability, material (iridium/platinum), user ratings, pack size, and technical specs relevant to fit and ignition performance
This roundup covers automotive replacement spark plugs under $100, highlighting high-value options across common electrode materials and OE-equivalent fits. Selections were based on performance ratings, material (iridium/platinum), pack sizes, and overall value scores from manufacturer specs and user-reviewed reliability
Top Picks
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1
NGK G-Power Platinum Alloy Spark Plug TR55GP (8 Pack)
NGK spark plugs, platinum alloy for reliable performance and longevity. Customers note smooth operation, improved fuel mileage, and easy installation
- platinum alloy spark plugs
- reliable OEM-like durability
- ease of installation
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2
NGK Iridium IX Spark Plug 4 Pack
Iridium IX spark plugs designed for performance enthusiasts with durable, stable spark and improved throttle response. Customers note easy installation, pre-gapped design, and smoother engine operation
- iridium IX for extreme ignitability
- tapered ground electrode reduces quenching
- pre-gapped convenience
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3
NGK G-Power Platinum Spark Plugs TR5GP (8 pcs)
G-Power Platinum spark plugs designed for wider heat range, resisting carbon buildup and pre-ignition. Noted for smooth engine operation and easy installation; some fit/gap inconsistencies reported
- wide heat range design
- gasket sealing prevents gas leakage
- easy installation
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4
Pack of 8 Motorcraft Spark Plug SP479 AGSF22WM
Genuine Motorcraft spark plugs designed for compatibility with specific vehicles. Includes the SP479 part for fit, form, and function. Customers report easy installation and solid value, with durability varying by usage
- genuine Motorcraft part
- fits specific vehicle models
- easy installation
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5
NGK LKAR7BIX-11S Iridium IX Spark Plug 4 Pack
Iridium IX spark plugs designed for performance enthusiasts, offering ignitability and stable spark. Customers note improved engine responsiveness and fuel efficiency
- iridium IX durability
- tapered ground electrode
- reduced fouling and smoother idle
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6
NGK BMW spark plugs set (6x) laser platinum OEM 3199
NGK spark plugs set for BMWs, delivering reliable performance and durability. Customers note easy installation and improved gas mileage
- OEM manufacturer quality
- Improved gas mileage noted by customers
- Easy installation
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7
Motorcraft Spark Plug SP-493 AGSF32PM (Pack of 8)
Spark plugs by Motorcraft, platinum construction, genuine Motorcraft parts. Customers note good fit and smooth engine performance with easy installation
- platinum durability
- genuine Motorcraft part
- easy installation
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8
NGK Iridium IX Spark Plug Pack (4)
Iridium IX spark plug set in a 4-pack. Improves idle stability, throttle response, and engine smoothness; customers report easy fit and pre-gapped design
- pre-gapped design
- improved idle and throttle response
- fits Mazda 3 2.3
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9
NGK Iridium Spark Plugs BKR6EIX 4-pack
NGK Iridium IX spark plugs, 4-pack, designed to replace multiple models. Improves engine performance and ease of installation, with out-of-the-box accurate gap reported by customers
- iridium IX spark plugs
- 4-pack convenience
- strong fit and performance feedback
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10
A-Premium Iridium Spark Plugs for Honda Accord & SUVs
A-Premium iridium spark plugs compatible with select Honda and SUV models. Benefits include easy installation and reliable performance; customers note smoother starts and long-lasting quality
- compatible with multiple models
- long-lasting iridium construction
- customer-reported smoother starts