The best automotive replacement spark plugs you can buy

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The best automotive replacement spark plugs you can buy

AI-generated summary · updated September 9, 2026 · verify details before purchase.

1 Best overall iridium plug NGK
NGK (6619) Iridium IX Spark Plug

4.7/5 $46.97 Only 12 left

Offers excellent durability and performance with iridium center electrode, improving fuel efficiency and throttle response.
- Long lifespan
- Improved fuel economy
- Smooth idle
- More expensive than copper plugs
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2 Best for high-performance engines Denso
Denso (4504) Iridium TT Spark Plug

4.6/5 $21.90 Only 4 left

Twin-tip iridium design provides better ignitability and lower voltage demand, ideal for modern engines.
- Enhanced ignition
- Durable construction
- Reduces misfires
- May not fit older engines
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3 Best direct OEM replacement Bosch
Bosch (4417) OEM Double Iridium Spark Plug

4.5/5 $27.37

OE-grade double iridium construction ensures consistent performance and long service life for many vehicles.
- OE quality
- Long life
- Reliable performance
- Pricier than single iridium
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4 Best budget pick Champion
Champion (7989) Copper Plus Spark Plug

4.4/5 $7.68

Affordable copper core plug with reliable performance for older vehicles and everyday driving.
- Low cost
- Good conductivity
- Widely available
- Shorter lifespan
- Not for high-performance
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5 Best for Japanese imports NGK
NGK (7090) BKR5EIX Iridium IX Spark Plug

4.7/5 $42.01 Only 1 left

Popular iridium plug for many Japanese models, offering easy starts and improved throttle response.
- Perfect fit for Honda/Toyota
- Quick ignition
- Durable
- Premium price
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6 Best for Ford vehicles Motorcraft
Motorcraft (SP-526) Fine Wire Iridium Spark Plug

4.5/5 $49.99

Engineered for Ford engines with fine-wire iridium tip for consistent spark and long life.
- Ford OE spec
- Reliable performance
- Long service interval
- Less universal fit
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7 Best for GM vehicles ACDelco
ACDelco (41-993) Professional Iridium Spark Plug

4.6/5 $27.99 Currently unavailable

Designed for GM engines with fine-wire iridium tip, providing reliable ignition and extended service intervals.
- GM OE spec
- Long durability
- Good value
- Limited brand compatibility
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8 Best value platinum plug Denso
Denso (4711) Platinum TT Spark Plug

4.5/5 $57.08 Currently unavailable

Twin-tip platinum design for improved durability and ignitability at a moderate price point.
- Good longevity
- Better than standard platinum
- Affordable
- Not as long-lasting as iridium
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Buying advice

When choosing spark plugs, consider your vehicle's make, model, and engine requirements. Iridium plugs offer longer life and better performance, while copper plugs are more budget-friendly for older engines. Always check your owner's manual for the correct heat range and gap. For modern cars, OEM or premium iridium plugs are recommended for optimal fuel efficiency and longevity.

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The best automotive replacement spark plugs you can buy

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