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Top rated automotive spark plug and ignition tools
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Best overall NGKNGK Iridium IX Spark Plugs (LFR5AIX-11)
Iridium center electrode for long life and improved fuel efficiency; popular choice for many vehicles.
- Long lifespan
- Improved throttle response
- Higher performance
- More expensive than copper plugs
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Best value BoschBosch Platinum+4 Spark Plugs (4417)
Four yttrium-enhanced ground electrodes for consistent performance and durability.
- Excellent durability
- Smooth idle
- Good fuel economy
- Not compatible with some older engines
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Best budget pick DensoDenso Platinum TT Spark Plugs (PK20TT)
Twin-tip design for better ignitability and a lower price point.
- Affordable
- Easy to install
- Good performance
- Shorter lifespan than iridium
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Best for high mileage vehicles Autolite Iridium UltraAutolite Iridium XP Spark Plugs (XP3924)
Iridium tip combined with a nickel-plated shell for corrosion resistance; designed to last up to 100k miles.
- Long service life
- Corrosion resistant
- Improved ignition
- May need gap adjustment
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Best for GM vehicles ACDelcoACDelco Professional Iridium Spark Plugs (41-962)
Original equipment for many GM cars; iridium tip for extended life and reliability.
- OEM fit
- Reliable performance
- Long-lasting
- Pricier than aftermarket
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Best budget copper plug ChampionChampion Copper Plus Spark Plugs (RN14YC)
Traditional copper core for good performance in older engines; very affordable.
- Very inexpensive
- Works well in older engines
- Widely available
- Short lifespan (20-30k miles)
- Less efficient than modern plugs
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Best gap tool Performance ToolPerformance Tool W80545 Spark Plug Gapper
Simple and effective tool for measuring and adjusting spark plug gap; built-in electrode bender.
- Accurate measurement
- Easy to use
- Inexpensive
- Not for fine gaps
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Best ignition tester LisleLisle 20600 Inline Spark Plug Tester
Checks spark output without removing plug; adjustable gap simulates load conditions.
- Quick diagnostics
- Adjustable gap
- Durable construction
- May not work on all coil types
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Best thread repair tool CTA ToolsCTA Tools 1779 Spark Plug Thread Chaser Set
Set of common thread chasers to clean or repair spark plug threads in aluminum heads.
- Prevents cross-threading
- Saves cylinder heads
- Good quality
- Limited sizes included
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Best socket for tight spaces GearWrenchGearWrench 80546 5/8-Inch Spark Plug Socket
Thin-wall, magnetic socket with a rubber insert to grip plugs securely; essential for any DIY mechanic.
- Magnetic grip
- Thin wall design
- High torque strength
- Only one size
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