Best Spark Plugs For Toyota 4Runner

#1 · Best Overall

1. Sixity Auto NGK Laser Iridium

• Core Material: Iridium
• Top Material Type: Iridium
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14mm

Best for: 2013–2020 4.0L V6 replacement.

Why it ranks #1: Its six genuine NGK laser iridium plugs are explicitly listed for 4.0L V6 4Runners from 2013 through 2020, giving clear, useful fitment.

A six-plug set of NGK Laser Iridium plugs is the defining draw here, giving owners of a 2013–2020 Toyota 4Runner 4.0L V6 a complete set of direct-replacement plugs in one purchase. Genuine NGK parts and included hardware support a straightforward replacement workflow.

The stated 2013–2020 4.0L V6 compatibility makes this set relevant to a specific run of 4Runner models, while the six-piece quantity supplies the full set together. Iridium core and top materials identify the electrode material, and the listed 14mm thread size and 0.04-inch gap provide concrete installation specifications. The product is described as a direct replacement and includes hardware, but vehicle fitment still needs confirmation for the individual 4Runner.

Skip it if you have a 2003–2013 4.0L V6; the DENSO Iridium Long Life set B0B7KSHX6Y lists that earlier application.

Choose this Sixity Auto set if your 4Runner is a listed 2013–2020 4.0L V6 and you want six NGK iridium replacements with hardware. Its stated vehicle coverage does not extend beyond 2020.

Listed on Amazon as: 6 pc NGK Laser Iridium Spark Plugs for Toyota 4Runner 4.0L V6 2013-20

#2 · Long-Life Iridium

2. Sixity Auto DENSO Iridium Long Life

• Core Material: Iridium
• Top Material Type: Iridium
• Compatible with Vehicle Type: Car, Truck

Best for: 2003–2013 4.0L V6 iridium.

Why it ranks #2: This six-pack of genuine DENSO iridium long-life plugs explicitly fits 4.0L V6 4Runners from 2003 through 2013 and lists a 0.4mm fine-wire center electrode.

A six-piece DENSO Iridium Long Life set specifically listed for 2003–2013 4.0L V6 Toyota 4Runners makes this a focused option for that generation. Its fine-wire 0.4mm iridium center electrode and 0.7mm platinum ground electrode are named construction details tied to the product’s performance claims.

The stated 2003–2013 4.0L V6 fitment gives owners a defined application, while six plugs provide a set for the listed engine. DENSO describes the fine-wire 0.4mm iridium center electrode as part of its Iridium Long Life design and says a larger spark translates to more power and superior fuel economy. Additional details identify a platinum ground strap and a 0.044-inch gap for installation planning.

Skip it if you have a 2014–2017 4.0L V6; the DENSO Iridium Long Life set B0D1S7ZM7T lists those later model years.

This is a targeted DENSO choice for owners of a listed 2003–2013 4.0L V6 4Runner who want iridium long-life construction. Its stated vehicle range does not include 2014–2017 models.

Listed on Amazon as: 6 pc DENSO Iridium Long Life Spark Plugs for Toyota 4Runner 4.0L V6 2003-13

#3

3. Sixity Auto DENSO Iridium Long Life

Best for: 2014–2017 DENSO long-life set.

Why it ranks #3: The six-plug set explicitly covers 4.0L V6 4Runners from 2014 through 2017 and identifies a 0.4mm iridium center electrode with a 0.7mm platinum ground electrode.

A fine-wire 0.4mm iridium center electrode paired with a 0.7mm platinum ground electrode distinguishes this DENSO Iridium Long Life six-pack. The listed Toyota 4Runner 4.0L V6 fitment covers 2014–2017, giving owners of those years a targeted replacement option.

DENSO lists this six-plug set for 2014–2017 4.0L V6 4Runners, making its application clear for that span. The 0.4mm iridium center electrode and 0.7mm platinum ground electrode are named construction details; DENSO says the larger spark translates to more power and superior fuel economy. Additional fitment information lists a 0.044-inch gap. The stated range is narrower than listings that cover later 4Runner years.

Skip it if you own a 2018–2020 4.0L V6; the NGK Laser Iridium set B0B7LTWTTJ lists those years in its application range.

This DENSO set fits the stated 2014–2017 4.0L V6 4Runner application and suits buyers seeking its iridium-and-platinum long-life construction. Its supplied fitment does not extend beyond 2017.

Listed on Amazon as: 6 pc DENSO Iridium Long Life Spark Plugs for Toyota 4Runner 4.0L V6 2014-17

#4 · NGK Iridium IX

4. Sixity Auto NGK Iridium IX

Best for: NGK fine-wire iridium set.

Why it ranks #4: This six-plug NGK iridium listing names 4.0L V6 4Runners from 2003 through 2013 and describes a fine-wire iridium center electrode.

A fine-wire iridium center electrode and precision laser-welded construction define this six-plug NGK Iridium IX set. The listing also identifies nickel-alloy ground electrodes and says the plugs are designed for fuel-injected and turbocharged engines, giving buyers specific construction and intended-use details to weigh.

NGK’s fine-wire iridium center electrode and nickel-alloy ground electrodes are described as supporting maximum engine horsepower and torque. Precision laser-welded electrode construction adds another stated design detail, while the fuel-injected and turbocharged engine suitability clarifies the listed intended use. The title names a six-piece set for Toyota 4Runner 4.0L V6 from 2003–2013. Unlike some alternatives, the supplied specifications do not include a thread size or gap measurement.

Skip it if you need a listed thread size and gap; the DENSO Iridium TT set B01MSA3SJ1 supplies both specifications.

Consider this NGK set for a listed 2003–2013 4.0L V6 4Runner when fine-wire iridium and laser-welded construction suit your priorities. Its supplied specifications leave thread size and gap unstated.

Listed on Amazon as: 6 pc NGK Iridium IX Spark Plugs for Toyota 4Runner 4.0L V6 2003-13

#5

5. Sixity Auto DENSO Iridium TT

• Core Material: Iridium
• Top Material Type: Iridium
• Compatible with Vehicle Type: Car, Truck
• Thread Size: M14x1.25

Best for: Iridium TT for 2003–2013.

Why it ranks #5: The six-pack listing specifies 4.0L V6 4Runner fitment from 2003 through 2013 and describes DENSO twin-tip iridium technology.

DENSO’s Iridium TT combines a 0.4mm iridium center tip with a 0.7mm platinum twin-tip, giving this six-pack a specifically described electrode pairing. The listing names 2003–2013 Toyota 4Runner 4.0L V6 compatibility, linking that construction to a defined model-year application.

The six-piece quantity matches the listed 2003–2013 4.0L V6 application, while the Iridium TT name is backed by details describing a 0.4mm iridium and 0.7mm platinum twin-tip design. DENSO says a larger spark translates to more power and superior fuel economy, giving the stated electrode design a practical performance rationale. M14x1.25 thread size is specified; the listed gap is 0.04 millimeters, so buyers should note the unit as supplied.

Skip it if you want platinum TT plugs rather than iridium; the DENSO Platinum TT set B0836DYLBB lists the same 2003–2013 4.0L V6 application.

This DENSO Iridium TT set suits owners of listed 2003–2013 4.0L V6 4Runners seeking the stated iridium-and-platinum twin-tip design. Pay attention to the gap unit as supplied.

Listed on Amazon as: 6 pc DENSO Iridium TT Spark Plugs for Toyota 4Runner 4.0L V6 2003-13

#6 · Platinum Twin-Tip

6. Sixity Auto DENSO Platinum TT

• Core Material: Platinum
• Top Material Type: Platinum
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 0.04 in

Best for: Platinum TT for 2003–2013.

Why it ranks #6: This six-pack explicitly fits 4.0L V6 4Runners from 2003 through 2013 and uses a 1.1mm platinum center electrode with a titanium-enhanced ground strap.

DENSO Platinum TT twin-tip construction, with a 1.1mm platinum center electrode and titanium-enhanced ground strap, sets this six-pack apart. It is listed for 2003–2013 Toyota 4Runner 4.0L V6 models, and DENSO connects the design with faster starts and a larger spark.

The stated 2003–2013 4.0L V6 fitment defines the intended 4Runner application, while six plugs supply the listed engine set. DENSO’s Platinum TT design combines a 1.1mm platinum center electrode with a titanium-enhanced ground strap, and the listing associates its larger spark with faster starts, more power, and superior fuel economy. Platinum core and top materials are specified; the stated gap is 0.04 inches.

Skip it if you prefer an iridium twin-tip design for 2003–2013 models; the DENSO Iridium TT set B01MSA3SJ1 lists that construction.

Pick this DENSO Platinum TT set if your 4Runner is a listed 2003–2013 4.0L V6 and you want its platinum twin-tip construction. Its stated year range excludes later applications.

Listed on Amazon as: 6 pc DENSO Platinum TT Spark Plugs for Toyota 4Runner 4.0L V6 2003-13

#7

7. Sixity Auto DENSO Standard

• Core Material: Copper
• Top Material Type: Copper
• Compatible with Vehicle Type: Car, Truck
• Thread Size: RM

Best for: Older 3.4L V6 copper plugs.

Why it ranks #7: It is explicitly listed for the older 3.4L V6 4Runner from 1996 through 2002, with copper construction and a stated 0.044-inch gap.

A stated 1996–2002 Toyota 4Runner 3.4L V6 application makes this six-pack of DENSO copper plugs a specifically targeted option for older trucks. DENSO describes its ground-electrode design as generating a larger spark nucleus, connecting the plug’s construction to its stated ignition and combustion benefits.

The listing ties these plugs to the 3.4L V6 4Runner from 1996 through 2002, with additional fitment details naming 0.044-inch gaps and resistor-plug construction. DENSO says complete fuel ignition can reduce emissions and misfires, while a larger spark nucleus supports more complete, consistent combustion. Copper core and top materials distinguish this set from the iridium options. Buyers should treat its older-engine fitment as the central selection boundary.

Skip it if you own a 2003–2013 4.0L V6; the DENSO Iridium Long Life set B0B7KSHX6Y lists that engine and year range.

This DENSO set suits owners maintaining a listed 1996–2002 3.4L V6 4Runner who want copper plugs and the stated electrode design. It is not the listed application for later 4.0L V6 models.

Listed on Amazon as: 6 pc DENSO Standard Spark Plugs for Toyota 4Runner 3.4L V6 1996-2002

#8

8. Yoshi Motors Iridium

• Core Material: Iridium
• Top Material Type: Iridium
• Compatible with Vehicle Type: Car

Best for: Iridium option for 2010–2024.

Why it ranks #8: Its title identifies an iridium plug for a 4.0L V6 4Runner from 2010 through 2024, but the listing lacks pack count and more detailed fitment evidence.

The title’s broad 2010–2024 Toyota 4Runner 4.0 V6 application is the clearest differentiator for this Yoshi Motors iridium spark plug. It gives buyers seeking a plug under that stated vehicle description a wide model-year span to consider, with iridium identified as both the core and top material.

Yoshi Motors identifies the product as an iridium spark plug for Toyota 4Runner 4.0L V6 models spanning 2010–2024, making the title’s year range the main selection guidance. The specifications confirm iridium core and top materials, but provide no additional construction or installation dimensions. That makes the listing less detailed for planning a plug change than sets that specify quantity, gap, or thread size. Use the stated application as a starting point and verify the exact vehicle configuration.

Skip it if you want a stated six-piece set with detailed plug specifications; NGK 6619 LFR6AIX-11 is sold as a six-pack and lists thread dimensions.

This Yoshi Motors option is for buyers considering an iridium plug under the title’s 2010–2024 4.0 V6 application. Its sparse specifications make it less informative for quantity and installation planning than detailed listings.

Listed on Amazon as: Iridium Spark Plug For NGK Toyota 4Runner 4.0L 4.0 V6 10-24

#9

9. NGK 6619 Iridium

• Core Material: Iridium
• Top Material Type: Iridium
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14mm (Thread Diameter), 1.25mm (Thread Pitch)

Best for: Wide-heat-range NGK plug set.

Why it ranks #9: This NGK six-pack uses iridium and lists a 14mm thread diameter, but its supplied details do not establish Toyota 4Runner fitment.

NGK’s stated wide operating heat range is the key differentiator of this six-pack of Iridium Spark Plugs, giving buyers a plug whose listed operating range exceeds that of ordinary plugs. The listing also highlights resistance to carbon buildup and pre-ignition, useful considerations when choosing replacement plugs.

The wide heat-range claim is paired with stated resistance to carbon buildup and pre-ignition, connecting the plug’s operating characteristics to buyers focused on those conditions. NGK’s patented triple-gasket sealing process is specifically described as eliminating the possibility of combustion-gas leakage. Six plugs are included, and the listed 14mm thread diameter with 1.25mm pitch gives installation dimensions. Unlike some products here, the supplied details do not name a 4Runner year range or engine fitment.

Skip it if you need a listed 4Runner year range; the NGK Laser Iridium set B0B7LTWTTJ specifies 2013–2020 4.0L V6 compatibility.

Consider this NGK six-pack if its heat-range, deposit-resistance, and sealing features match your priorities. The supplied listing does not identify 4Runner years or engine size, so it offers less explicit vehicle-specific guidance.

Listed on Amazon as: NGK 6619 Iridium Spark Plugs LFR6AIX-11-6 Pack

#10

10. DENSO 3324 Iridium Long Life

• Core Material: Iridium
• Top Material Type: Iridium
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14mm

Best for: Four-piece DENSO iridium set.

Why it ranks #10: The four-pack of genuine DENSO iridium plugs lists a 14mm thread, but the supplied information does not identify a Toyota 4Runner year or engine.

Four genuine DENSO 3324 iridium plugs distinguish this set from the six-piece choices in this roundup, making it relevant to buyers whose replacement needs match that quantity. The SK16R11 model identification and 14mm thread size provide specific product details alongside the long-life iridium name.

DENSO identifies these as 3324 Iridium Long Life plugs, with iridium core and top materials and a 14mm thread size. The four-piece quantity may suit a buyer sourcing that exact number rather than a six-plug set. Original packaging and hardware are included, and the listing calls them direct replacement auto parts. However, the supplied product details do not name Toyota 4Runner years or engine displacement, so the title alone does not establish a specific 4Runner application.

Skip it if you need an explicitly listed 4Runner application; the DENSO 2014–2017 4.0L V6 set B0D1S7ZM7T names its year range.

Choose this four-piece DENSO set if its quantity and 14mm thread detail suit your replacement plan. The listing identifies no 4Runner years or engine, so its vehicle-specific fitment is not established here.

Listed on Amazon as: DENSO # 3324 Iridium LONG LIFE Spark Plugs — SK16R11 —– 4 PCS NEW