The best spark plug for a Nissan Altima is typically an OEM-equivalent iridium or platinum plug from NGK or Denso, matched to your engine and model year. Copper plugs are not recommended for modern engines. Always verify the exact part number in your owner’s manual or with a Nissan dealer.
Choosing the right plug starts with identifying your Altima’s engine and year, since the recommended plug type and gap can differ between the 2.5L four-cylinder, the 3.5L V6, and the newer 2.0L VC-Turbo engines used since 2019. This guide outlines how to determine the correct plug and what options are typically appropriate.
Know Your Altima Engine and Year
Altimas have used several engine configurations over the years. The most common today are the 2.5L four-cylinder, with older Altimas using the 3.5L V6, and the 2.0L VC-Turbo introduced in 2019. While the exact plug part number varies by configuration and year, the underlying guidance remains the same: use a high-quality, OEM-recommended iridium or platinum plug from NGK or Denso.
2.5L four-cylinder
This engine family generally benefits from iridium or platinum spark plugs; use NGK or Denso plugs that match the OEM specification for your model year. The exact part number and gap specification are listed in the owner's manual or Nissan parts catalog. Replacing all four plugs at the same time is common practice for even wear.
3.5L V6
Older Altimas with the 3.5L V6 also use iridium or platinum plugs. Again, follow the OEM spec for part numbers and gap, which can be found in the owner's manual or through a Nissan dealer or parts catalog.
2.0L VC-Turbo
Newer Altimas with the VC-Turbo engine typically require iridium or platinum NGK/Denso plugs as specified by Nissan. The correct part number and gap are available in the service manual and parts catalog for your exact year and trim.
Recommended plug types by engine
Below is the general guidance you should follow when selecting a spark plug for your Altima. This list focuses on the type and brands that are commonly approved for Nissan engines.
- OEM-equivalent iridium or platinum plugs from NGK or Denso (preferred option).
- Aftermarket plugs that match the OEM specifications (also acceptable if clearly labeled as equivalent).
- Copper plugs are not recommended for modern Altima engines due to shorter service life and higher risk of fouling.
In practice, sticking with an OEM-recommended NGK or Denso plug (iridium or platinum) ensures the best balance of longevity, cold-start performance, and reliability across Altima engines.
How to choose the right OEM part
To ensure you purchase the exact right part for your Altima, follow these steps:
- Identify your engine code and model year (and whether you have the 2.5L, 3.5L, or 2.0L VC-Turbo).
- Check the owner's manual or NissanParts or the dealer parts catalog for the exact spark plug part number and gap specification.
- Buy a complete set of four plugs to maintain uniform wear across all cylinders.
- Confirm the plugs come pre-gapped to the OEM specification; if not, gap them as instructed in the service manual before installation.
- Follow the official torque specification and procedure when installing (do not reuse old gaskets or apply excessive force).
Following these steps minimizes misfires and ensures reliable ignition across the entire engine life.
DIY vs Professional service
Replacing spark plugs on an Altima is a common DIY task for many owners, provided you have basic tools and the correct replacement plugs. Complex access points or difficult coil packs can make it more challenging on some engines, and turbo or V6 configurations may benefit from professional service to ensure proper torque and sealing.
Summary
In short, the best spark plug for a Nissan Altima is typically an OEM-equivalent iridium or platinum plug from NGK or Denso, matched to your engine and year. Always refer to the owner’s manual or Nissan parts catalog for the exact part number and gap, and replace all four plugs at once to ensure balanced performance and longevity. Copper plugs are not recommended for modern Altimas, and sticking with the OEM spec provides the best balance of reliability and efficiency.