Answer depends on the engine: the 2012 Altima uses either the 2.5L inline-4 (QR25DE) or the 3.5L V6 (VQ35DE). In practice, use an iridium or platinum spark plug in the proper heat range for your engine, commonly from NGK or Denso, with a gap around 0.043 inch. Check your owner’s manual or a parts database to confirm the exact part number for your VIN.
Engine options in the 2012 Altima
In 2012, the Altima was offered with two engine choices. The four-cylinder models use the QR25DE engine, while the V6 models use the VQ35DE. The spark plug type and gap are engine-specific, so selecting the right plug requires identifying your engine code either on the engine label or in the vehicle paperwork.
2.5L QR25DE (four-cylinder)
For the 2.5-liter QR25DE, the general guidance is to install a long-life iridium or platinum plug from a reputable brand. The goal is a plug that can withstand the engine’s ignition environment and maintain efficiency. Use the heat-range and reach recommended by the plug manufacturer for the QR25DE, and set the electrode gap to the specification listed on the packaging (commonly around 0.043 in or 1.1 mm).
Before listing the available options, note that the exact part number depends on the engine variant and the supplier’s catalog. The following options are representative categories you can ask for at parts counters or check in an online parts database by entering your VIN:
- Iridium or platinum spark plugs designed for Nissan 2.5L engines (NGK or Denso brands).
- OEM-recommended equivalents that specify compatibility with QR25DE.
- Premium long-life plugs that meet or exceed the factory heat range and heat transfer requirements.
- Plugs with a nominal 0.043 in (1.1 mm) electrode gap, or the gap specified on the packaging.
In practice, mechanics commonly select iridium- or platinum-tipped plugs from NGK or Denso for the QR25DE, and many plugs labeled for Nissan 2.5L engines will fit without modification.
3.5L VQ35DE (V6)
The 3.5-liter V6 uses a different heat range and thread specification. For the VQ35DE, opt for iridium or platinum plugs rated for the VQ series engines. Again, aim for plugs designed for long life and the correct heat range, with a typical small gap around 0.043 inches (1.1 mm), unless the packaging specifies otherwise.
Before listing the options, remember that the exact candidate part numbers depend on the catalog and the engine version. The following categories cover common high-quality options you may see when shopping by VIN:
- Iridium- or platinum-tipped plugs suitable for the VQ35DE family (NGK or Denso brands).
- OEM-recommended equivalents for the 3.5L Nissan V6 engine.
- Plugs designed for long-life performance that match the proper heat range for the VQ35DE.
- Gaps near 0.043 inches (1.1 mm) unless specified otherwise.
Many Altima V6 owners use NGK or Denso iridium plugs that fit the VQ35DE, and the OEM part number may be available through Nissan dealerships or after-market retailers with VIN lookup.
What to buy and how to verify
To ensure you purchase the exact spark plugs your car needs, use these steps to verify the correct part number before buying:
- Identify the engine: check the engine badge, the Owner’s Manual, or the service sticker under the hood to confirm QR25DE vs VQ35DE.
- Consult the dealer or a reputable parts retailer: search by VIN or engine code to pull the official Nissan replacement part number and compatible NGK or Denso options.
- Match heat range and thread length: ensure the plugs match the engine’s heat range, electrode type (iridium/platinum), thread size, and reach; verify the gap on the packaging.
- Consider replacement interval and driving conditions: if you drive aggressively or in harsh conditions, you may opt for a spark plug with longer life and the recommended replacement interval (typically 60,000–100,000 miles depending on plug type).
Always torque the plugs to the manufacturer’s specification, and use anti-seize or thread lubricant only if the factory does not provide a sealant or if the plugs require it. When in doubt, have a certified mechanic perform the replacement.
Summary
The 2012 Nissan Altima requires spark plugs that match its engine—2.5L QR25DE or 3.5L VQ35DE. Choose iridium or platinum plugs from NGK or Denso, with a nominal gap of about 0.043 inches, and verify exact part numbers via VIN lookup or the owner's manual. When buying, prioritize long-life, brand-approved parts and adhere to the recommended service intervals and torque specs.