Infiniti G20 Spark Plug Guide for 1991-2002 Models
Keep your G20's SR20DE engine running strong by choosing the right spark plugs for a smooth idle and restored performance.
- For best results, use NGK or Denso brand spark plugs, as the G20's SR20DE engine is sensitive to plug choice.
- The standard NGK V-Power plug (BKR6E-11) is the recommended OEM-style choice for stock vehicles.
- The correct spark plug gap is 1.1mm (0.044 inches); always verify the gap before installation.
- If you find oil on the plugs, your valve cover gasket is likely leaking and should be replaced.
Signs of Failing Spark Plugs
When your G20's spark plugs start to wear out, you'll likely notice. The signs can be subtle at first but will worsen over time. Worn plugs have a harder time creating a good spark, which can lead to a variety of engine performance issues.
Common Symptoms of Bad Spark Plugs:
- Rough Idle: The engine may shake or vibrate more than usual when stopped.
- Engine Misfires: You might feel a hesitation or stumble from the engine, especially under acceleration.
- Poor Acceleration: The car may feel sluggish or less responsive when you press the gas pedal.
- Reduced Fuel Economy: You may find yourself filling up the gas tank more often. A worn spark plug can reduce fuel economy by up to 30%.
- Difficulty Starting: A car that is slow to start or won't start at all can be a sign of worn-out spark plugs.
Choosing the Right Aftermarket Spark Plugs
When shopping for new spark plugs for your 1991-2002 G20, you'll find several brands and types. For the SR20DE engine in your Infiniti, sticking close to the original equipment (OEM) design is highly recommended for reliable performance. Nissan and Infiniti vehicles of this era are known to perform best with NGK or Denso plugs.
Brand & Material Tiers
Tier 1: OEM Equivalent (Recommended)
- NGK: NGK is the original equipment manufacturer for many Japanese vehicles, including your G20. The standard NGK V-Power (BKR6E-11) is an excellent, affordable choice that matches the original design. For a longer life and improved performance, especially in modified engines, NGK Iridium IX plugs are a popular upgrade.
- Denso: Denso is another top-tier Japanese brand that provides OEM-quality plugs. Their Iridium Long-Life plugs are a great alternative to NGK, offering excellent durability and performance.
Tier 2: Quality Alternatives
- Bosch: Bosch offers a range of platinum and iridium plugs that are a suitable alternative. While they are a reputable brand, most G20 and SR20DE enthusiasts prefer to stick with NGK or Denso for best compatibility.
Tier 3: Budget Options
- Autolite & Champion: These brands are widely available and often cheaper. However, for Japanese engines like the SR20DE, it's generally advised to avoid these in favor of NGK or Denso to prevent potential compatibility or performance issues.
Pro Tip: For a stock, daily-driven G20, the standard NGK V-Power (BKR6E-11) or the equivalent Denso plug offers the best combination of performance, reliability, and value. Upgrading to iridium is a good choice for longevity but isn't strictly necessary for a stock engine.
Known Issues, Recalls, and TSBs
There are no specific recalls or Technical Service Bulletins (TSBs) from Infiniti or the NHTSA related to spark plugs for the 1991-2002 G20. Any issues you experience are most likely due to normal wear and tear. One common issue not related to the plug itself is oil leaking onto the spark plugs from a worn valve cover gasket, which can cause misfires. If you see oil in the spark plug tubes when you change them, you should replace the valve cover gasket set as well.
| Plug Type | Typical Price Per Plug | Best For |
|---|---|---|
| Standard Nickel (NGK V-Power, etc.) | $3 - $8 | Stock engines, regular maintenance |
| Platinum / Double Platinum | $7 - $15 | Longer life than standard plugs |
| Iridium | $10 - $22 | Longest life, high performance, modified engines |
Frequently Asked Questions (FAQ)
How often should I change my G20's spark plugs?
For standard copper/nickel plugs, a good interval is every 30,000 miles. If you upgrade to platinum or iridium plugs, you can extend that interval to 60,000 miles or more, but always check your owner's manual for the official recommendation.
What is the correct spark plug gap for the Infiniti G20?
The recommended spark plug gap for the 1991-2002 G20 is 1.1mm (or 0.044 inches). Most plugs with a "-11" in their part number (like NGK BKR6E-11) come pre-gapped to this specification. It is still a good practice to verify the gap with a feeler gauge before installation.
Should I use anti-seize on the spark plug threads?
This is a debated topic. NGK officially recommends against using anti-seize on their modern plugs because the trivalent metal plating already provides anti-seizing properties and using additional lubricant can lead to over-torquing. If you do use it, use only a very small amount and reduce the torque specification slightly.
What's the difference between copper, platinum, and iridium plugs? 🎬 Watch this comparison to see which spark plug type is best.
The main difference is the material of the center electrode, which affects durability and performance. Copper plugs are excellent conductors but wear out the fastest. Platinum and Iridium are harder metals with much higher melting points, so they last significantly longer and maintain a precise spark for better efficiency over their lifespan.
Helpful Videos
Technical Specifications
OEM Part Numbers: BKR6E-11 BKR6EIX-11
Thread Size: 14mm, Hex Size: 5/8" (16mm), Reach: 19mm (0.75"), Seat Type: Gasket, Gap: 1.1mm (0.044")
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- INFINITI G20: