The best spark plugs for a 2017 Nissan Altima are iridium or platinum plugs from reputable brands such as NGK or Denso, selected to match your specific engine (2.5L inline-4 or 3.5L V6) and installed to the proper Nissan specifications. In practice, choose OEM-equivalent iridium plugs for longevity and reliable performance, and plan for replacement roughly every 60,000–100,000 miles depending on driving conditions.
Engine options in the 2017 Altima
The 2017 Altima was offered with two main engines. The majority of AVTs and trims used the 2.5-liter inline-4 (QR25DE), while a 3.5-liter V6 (VQ35DE) was available in higher-end configurations. Spark plug choices vary by engine, so it’s important to match the plug type to the engine model.
2.5L QR25DE spark plugs
For the 2.5L QR25DE engine, iridium or platinum plugs from NGK or Denso are commonly recommended, prioritizing longevity and smooth idle. These plugs are designed to tolerate the engine’s operating conditions while delivering consistent spark and combustion efficiency.
- NGK Iridium IX spark plugs
- Denso Iridium TT spark plugs
- OEM-equivalent Nissan Genuine or Nissan-approved NGK/Denso replacements
Replacing with one of these reputable iridium/platinum options typically provides durable performance and good cold/hot tolerance for the 2.5L Altima, with a recommended interval that often falls around 60,000 miles under normal driving. Always confirm the exact part number and gap with your owner’s manual or a Nissan dealer.
3.5L V6 spark plugs
The 3.5L V6 option uses a different firing configuration and may benefit from similar high-quality iridium plugs, with brands such as NGK or Denso being common factory-replacement choices. The goal is to maintain reliable ignition timing and combustion efficiency across the bank of cylinders.
- NGK Iridium IX spark plugs
- Denso Iridium TT spark plugs
- Nissan Genuine or OEM-equivalent spark plugs
For the V6, as with the 2.5L, follow the manufacturer’s recommended interval and gap specification, and prefer iridium plugs for longer life and stable performance in a higher-compression setup.
What to consider when choosing spark plugs
When selecting spark plugs for your 2017 Altima, several factors influence the best choice beyond engine size. Consider these points to ensure you pick the right plugs for your vehicle and driving style.
- Engine compatibility: Confirm whether your Altima has the 2.5L four-cylinder or the 3.5L V6, as it drives the recommended plug type and tension.
- Platinum vs iridium: Iridium plugs typically offer longer life and better cold-start performance; platinum plugs are a solid balance of cost and longevity.
- OEM vs aftermarket: OEM-equivalent plugs from NGK or Denso are designed to match Nissan’s tolerances; aftermarket options from these brands are generally reliable as well.
- Gap specification: Use the gap specified in your owner’s manual or by Nissan; incorrect gaps can affect starting, misfires, and fuel economy.
- Maintenance interval: Iridium/platinum plugs often last longer (roughly 60k–100k miles) than copper plugs; driving conditions (short trips, heavy loads) can shorten intervals.
- Driving conditions: If you regularly tow, drive in extreme temperatures, or run with performance-tuning, you might choose higher-grade plugs that maintain performance under stress.
Choosing the right spark plug type typically centers on longevity and reliability rather than dramatic performance gains in a stock Altima. Following Nissan’s guidance and using reputable brands helps protect the ignition system and fuel economy.
Installation and maintenance tips
Installing spark plugs correctly is key to getting the promised performance and lifespan. Follow these practical guidelines to ensure a proper installation and ongoing reliability.
Pre- and post-installation considerations
Before installation, verify the exact plug type and gap for your engine, clean the spark plug wells, and inspect ignition coils and boots for wear. After installation, torque plugs to the recommended specification and perform a quick inspection of coil packs and wiring for secure connections.
Summary: For a 2017 Nissan Altima, iridium plugs from NGK or Denso (OEM-equivalent) are the best general choice, with the exact part number dependent on whether you have the 2.5L or 3.5L engine. Prioritize OEM recommendations, maintain proper gap and torque, and replace at the service interval that matches your driving conditions.
Summary
In short, opt for iridium or platinum plugs from NGK or Denso that match your engine (2.5L or 3.5L), adhere to Nissan’s gap and torque specs, and plan for a replacement roughly every 60,000–100,000 miles depending on usage. This approach delivers reliable starting, smooth idle, and efficient combustion for the 2017 Altima.