What Kind of Spark Plugs Does a 2015 Hyundai Elantra Take?

A 2015 Hyundai Elantra typically uses long‑life iridium or platinum spark plugs, with most 1.8L and 2.0L gasoline models in North America calling for NGK or Denso fine-wire iridium plugs in a heat range and design that match OEM specifications (for example, NGK IFR5G-11 / SILZKR7B11 equivalent), pre-gapped to about 0.043 inches (1.1 mm). The exact plug type depends on engine code, emissions certification, and market, so the safest approach is to match the original equipment part number from the owner’s manual, emissions label, or a trusted parts catalog.

Understanding the 2015 Hyundai Elantra Engine Variants

The kind of spark plug your 2015 Hyundai Elantra needs depends primarily on which engine is under the hood and where the vehicle was sold. While many owners assume all Elantras share the same components, Hyundai used several similar—but not identical—spark plug part numbers across regions and trim levels, especially between the base engines and the sportier variants.

Main Engines Used in the 2015 Elantra (North America)

The following list outlines the main gasoline engines available in the 2015 Elantra lineup for the U.S. and Canada, which determines which spark plug families are correct.

• 1.8L Nu MPI (Engine code: “Nu” 1.8) – Common in SE/GLS and base trims; the most widespread engine in 2015 models.
• 2.0L Nu GDI (Engine code: “Nu” 2.0) – Used mainly in some Limited models and certain trims in specific markets.
• 2.0L GDI “Elantra Sport” (where offered) – In some regions, this tune or trim may use the same basic plug type but can have different part numbers or heat ranges.

While the engines share the same general architecture, each may have a slightly different OEM spark plug part number, so it is important to confirm your exact engine and trim before purchasing replacement plugs.

OEM Spark Plug Types and Specifications

Hyundai equips the 2015 Elantra from the factory with long-life, fine-wire spark plugs designed to last roughly 90,000–105,000 miles (about 145,000–170,000 km) under normal conditions. These plugs are typically iridium or platinum tipped, chosen for durability and consistent ignition in modern, high-compression engines.

Factory-Style Spark Plug Types by Engine

The following list summarizes the typical OEM-style spark plug types used in 2015 Hyundai Elantras by engine, focusing on North American gasoline models. Exact part numbers can differ slightly by market, but these represent the standard specifications or their common aftermarket equivalents.

• 1.8L Nu MPI (most 2015 Elantra SE/GLS/base)

  Typical OEM-style plug: iridium fine-wire spark plug

  Common equivalents used by parts retailers:

  • NGK Iridium (e.g., IFR5G-11 or SILZKR7B11 equivalents, depending on catalog)
  • Denso Iridium counterparts specified for the 1.8L Nu engine

  Heat range and design: Matched to Hyundai’s Nu engine specifications, with a projected tip and resistor design.

• 2.0L Nu GDI (Limited / some upper trims)

  Typical OEM-style plug: iridium or platinum fine-wire spark plug

  Common equivalents:

  • NGK Iridium plugs in the same family but with a slightly different heat range and design suited to GDI operation.
  • Denso Iridium plugs specified for the 2.0L Nu GDI engine in parts catalogs.

  These plugs are engineered to withstand higher combustion pressures and temperatures associated with gasoline direct injection.

Although different part numbers may appear across catalogs, they generally share the same core attributes: fine-wire iridium or platinum contacts, resistor design, and Hyundai-approved heat range and thread dimensions. When in doubt, cross-check the part number against Hyundai’s OE specification or a reputable catalog by VIN.

Spark Plug Gap and Key Dimensions

Beyond brand and metallurgy, the spark plug gap and physical dimensions must match Hyundai’s standards for the 2015 Elantra to maintain proper ignition performance and avoid engine damage or misfires.

The following list summarizes the primary dimensional specifications most 2015 Elantra gasoline models share for their spark plugs.

• Thread size: 12 mm (M12 x 1.25 typically)
• Reach (thread length): Approximately 26.5 mm (varies slightly by plug design)
• Seat type: Tapered or gasket seat depending on OEM design; always match the original.
• Hex size: Commonly 14 mm or 16 mm depending on the exact plug model; confirm with tool specs.
• Heat range: OEM-matched to the Nu 1.8L or 2.0L; do not change heat range unless advised by a qualified tuner or technician.
• Factory gap: Approximately 0.043 inches (1.1 mm) for most 2015 Elantra gasoline engines.

While iridium plugs are usually sold pre-gapped, it is still recommended to carefully verify the gap with an appropriate gauge before installation, adjusting only if the manufacturer allows it. For many ultra-fine-wire iridium designs, manufacturers caution against aggressive bending to avoid damaging the tip.

Choosing Replacement Spark Plugs: OEM vs. Aftermarket

When replacing spark plugs on a 2015 Hyundai Elantra, owners typically face a choice between sticking with genuine Hyundai-branded plugs or using equivalent aftermarket plugs from established manufacturers like NGK, Denso, or Bosch. Each option has advantages, depending on cost, availability, and personal preference.

Genuine (OEM) Spark Plugs

Original Equipment Manufacturer (OEM) spark plugs are those supplied by Hyundai (often produced by NGK or Denso under Hyundai part numbers). They are guaranteed to match the exact specifications used at the factory.

The following list highlights why many technicians and dealers favor genuine Hyundai plugs for a 2015 Elantra.

• Exact match to factory spec: Ensures correct heat range, reach, and tip design.
• Pre-approved for warranty and reliability: Reduces questions about compatibility or long-term performance.
• Optimized for emissions and fuel economy: Helps maintain the vehicle’s original efficiency and emissions certification.
• Known performance in the Nu engine: Less risk of cold-start issues, misfires, or drivability quirks.

Using genuine Hyundai spark plugs is often the safest option for owners who prefer to avoid any guesswork and want to maintain factory performance as closely as possible.

Aftermarket Iridium and Platinum Options

High-quality aftermarket plugs from reputable brands can match or in some cases slightly exceed OEM performance when properly specified. They are often more widely available and may be less expensive than dealer-sourced parts.

The following list describes common aftermarket choices and considerations for the 2015 Hyundai Elantra.

• NGK Iridium plugs: Frequently listed as direct replacements for Hyundai Nu engines, known for reliability and long life.
• Denso Iridium plugs: Another mainstream choice that often mirrors the OE design, especially when Hyundai’s OE plug is Denso-made.
• Bosch fine-wire iridium or platinum plugs: Available for the Elantra in many markets; must be matched to the correct part number and heat range.
• Service life: Quality iridium plugs are typically rated for ~90,000–100,000 miles, similar to or slightly better than OEM ratings when used in normal driving.
• Avoid generic or no-name brands: Inexpensive plugs can cause misfires, poor fuel economy, or early failure, especially in GDI engines.

When choosing aftermarket plugs, the key is not the brand name alone but confirming that the plug is explicitly cataloged as a direct replacement for the 2015 Elantra engine code and matches the OEM specifications in thread size, reach, heat range, and gap.

How to Confirm the Correct Spark Plug for Your Specific Elantra

Because small differences in emissions package, trim, and market can lead to different official part numbers, verifying the correct spark plug for your particular 2015 Elantra is essential before ordering or installing new units.

Reference Points for Accurate Part Identification

The following list outlines practical steps to confirm the exact plug your car requires, minimizing the risk of an incorrect purchase.

1. Check the owner’s manual: Look in the maintenance or specifications section, where Hyundai often lists the exact spark plug type or at least a reference code.
2. Inspect the under-hood emissions label: Some vehicles list the recommended spark plug part number or specification on a label near the radiator support or underside of the hood.
3. Use your VIN with a dealer: Contact a Hyundai dealer’s parts department and provide your Vehicle Identification Number; they can pull up the precise OEM part number and recommended replacement.
4. Use a reputable online catalog: NGK, Denso, and major auto parts retailers allow you to enter year, make, model, and engine to find compatible spark plugs.
5. Match the existing plug: If the current plugs are original, record the brand and code stamped on the metal shell and use that to cross-reference new plugs.

By cross-checking at least two of these sources—such as the owner’s manual plus a dealer or manufacturer catalog—you can be confident that the replacement spark plugs will be correct for your specific model and market.

Service Interval and Replacement Tips

Even long-life spark plugs eventually wear out, and delayed replacement can lead to misfires, reduced fuel economy, and added stress on ignition coils and catalytic converters. Hyundai’s maintenance schedule for the 2015 Elantra typically recommends replacement around the 90,000–105,000 mile mark under normal driving conditions, though severe use may justify earlier inspection.

Basic Maintenance Guidelines

The following list summarizes practical tips when replacing spark plugs on a 2015 Hyundai Elantra to ensure safe and effective service.

• Replace all plugs at once: Always change the full set (usually four plugs), not just one, to maintain balanced performance across all cylinders.
• Work on a cold engine: Allow the engine to cool completely before removing plugs to reduce the risk of thread damage in the aluminum cylinder head.
• Use the correct socket & torque: A spark plug socket with a rubber insert and a torque wrench set to the manufacturer’s spec (often around 14–18 lb-ft / 19–24 N·m, but confirm for your engine) helps prevent over-tightening.
• Avoid anti-seize unless specified: Many modern plugs have special plating to prevent seizing; adding anti-seize can alter torque values and is usually not recommended unless the plug maker explicitly allows it.
• Do not change heat range for stock engines: Stick with the factory-specified heat range unless the vehicle is significantly modified and you have expert guidance.

Following these guidelines helps protect the aluminum head from damage, promotes proper sealing of the combustion chamber, and supports the long-term durability of both the new plugs and the ignition system.

Summary

The 2015 Hyundai Elantra uses long-life fine-wire spark plugs—typically iridium, sometimes platinum—matched to its Nu-series 1.8L or 2.0L gasoline engines. For most North American models, OEM-style NGK or Denso iridium plugs, pre-gapped to about 0.043 inches (1.1 mm), are correct and designed to last around 90,000–105,000 miles. However, exact part numbers vary by engine code and market, so the most reliable approach is to confirm the plug specification through the owner’s manual, the vehicle’s emissions label, a Hyundai dealer using your VIN, or a reputable spark plug manufacturer’s catalog. Sticking with OEM-spec iridium plugs and following proper installation practices ensures dependable ignition performance, fuel economy, and engine longevity in the 2015 Elantra.

What is the spark plug number for a 2015 Hyundai Elantra?

NGK Iridium IX Iridium Spark Plug 93175.

What spark plugs are best for Hyundai?

The best spark plugs for a Hyundai are typically NGK or Denso iridium or platinum plugs, as these are often the original equipment manufacturer (OEM) brands. For most stock vehicles, using the OEM-recommended spark plugs is the most reliable option, but for performance-oriented or modified engines, NGK iridium or HKS plugs may offer better performance. 
You can watch this video to learn how to replace spark plugs on a Hyundai Elantra: 46sdial2fastYouTube · Dec 18, 2022
Recommended spark plug types

• NGK Iridium: This is a highly recommended option, often the factory plug, known for its long life and excellent performance. 
• Denso Iridium: Another excellent OEM choice that is often favored for efficiency and smooth operation. 
• NGK Ruthenium: Considered a premium option, these are an upgrade to iridium and offer a long lifespan. 
• NGK or Denso Platinum: These are a good, less expensive option that still offer a good balance of performance and longevity, though iridium will last longer. 
• HKS M45IL/M45XL: These are high-performance plugs that can provide a slight power increase, but they are best used in a tuned engine with an appropriate gap setting. 

Factors to consider

• Engine type: Ensure you select the correct spark plug for your specific engine size, such as the 1.6T or 2.4L. 
• Engine tuning: If you have a modified or tuned engine, you may need a colder spark plug with a smaller gap for optimal performance. Consult the tuner’s recommendations. 
• OEM vs. aftermarket: While aftermarket plugs can be a good option, it’s often safest to stick with the OEM brand and model for a stock vehicle to avoid potential issues. 
• Longevity: Iridium plugs are the most durable and will last the longest (up to 120,000 miles or more), followed by platinum, then copper. 

What kind of spark plugs does a Hyundai Elantra take?

4 pc NGK Laser Iridium Spark Plugs compatible with Hyundai Elantra GT 1.8L 2.0L L4 2013-2020.

What is the spark plug gap on a 2015 Hyundai Elantra?

The correct spark plug gap for a 2015 Hyundai Elantra is 0.0440.0440.044 inches (or 1.11.11.1 mm). This specification applies to the 1.8L engine and many other engines for that model year. 
You can watch this video to see a demonstration of the spark plug replacement process including gapping: 1mCruisin’ With GregYouTube · Aug 3, 2025

• Gap: 0.0440.0440.044 inches (1.11.11.1 mm) 
• Importance: Ensure the spark plug is gapped correctly before installation for optimal engine performance. 
• Examples of compatible plugs: NGK Iridium IX, Denso Iridium, and Bosch Fine Wire Double Iridium plugs are often listed with this gap, O’Reilly Auto Parts and O’Reilly Auto Parts note.