For a 2010 Honda Accord, the best spark plugs are high-quality iridium plugs from NGK or Denso, or the OEM Honda plugs, installed to the factory gap. In practice, NGK Laser Iridium IX or Denso Iridium Power are top choices; always confirm the exact part number for your engine and trim.
The 2010 Accord came with two powertrains: a 2.4-liter four-cylinder and a 3.5-liter V6. While both benefit from iridium or platinum plugs for longevity, the recommended heat range and replacement interval are set by Honda and can vary by engine. Use the manufacturer gap spec and proper torque when installing.
Engine options and plug recommendations
The following recommendations cover both engines and highlight options with proven performance in Honda engines of this era.
- NGK Laser Iridium or NGK Iridium IX plugs — widely recommended for 4-cylinder Honda engines for longevity and reliable ignition.
- Denso Iridium Power plugs — another strong option, offering long life and solid performance in both 4- and 6-cylinder Accords.
- OEM Honda/Acura spark plugs (Iridium or Platinum) — guaranteed compatibility with heat range and gaps, but often a bit more expensive.
When choosing an aftermarket plug, ensure the heat range matches Honda's specification and the gap is correct for your engine. If in doubt, consult the owner's manual or a trusted technician.
Why iridium plugs are favored
Iridium plugs last longer and resist fouling better than traditional copper plugs, which reduces maintenance intervals and helps maintain fuel economy and smooth idle. They also tend to resist electrode erosion in high-mileage engines like the 2010 Accord.
Installation basics
Always use the correct torque and gap, and follow the plug manufacturer’s guidance for anti-seize or dielectric grease. For Honda engines, torque is typically in the mid-to-high range for spark plugs, and the gap is commonly around 0.043–0.047 inches, but you should verify from the manual or the plug packaging.
Replacement intervals
Iridium and platinum plugs are designed for longer life than copper plugs. Typical replacement intervals under normal driving are around 100,000 miles for iridium/platinum plugs, though actual mileage can vary with driving conditions and maintenance history. Copper plugs usually require replacement sooner, around 30,000–60,000 miles.
- Iridium/platinum plugs: about 100,000 miles under normal driving conditions.
- Copper plugs: about 30,000–60,000 miles, depending on driving conditions and heat range.
- Always follow Honda's service manual recommendations and inspect plugs if you notice misfiring or reduced performance.
Regular inspection of spark plugs, ignition coils, and ignition wires helps prevent misfires and keeps the Accord running smoothly.
Summary
For a 2010 Honda Accord, the best spark plugs are high-quality iridium options from NGK or Denso, or the OEM Honda plugs. Iridium plugs offer longer life and reliable performance, with typical replacement around 100,000 miles. Always verify the exact part number for your engine variant and follow the specified gap and torque in your owner's manual. If you prefer OEM fit, choose Honda/Acura plugs; for aftermarket options, NGK Laser Iridium IX or Denso Iridium Power are widely trusted choices.