Best Spark Plugs For 5Th Gen 4Runner: NGK and DENSO Compared

#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: Later 4.0L V6 replacement set.

Why it ranks #1: Its listing explicitly fits 2013–2020 4Runner 4.0L V6 models and supplies six NGK Laser Iridium plugs, making it the clearest match.

A listed application covering 2013–2020 Toyota 4Runner 4.0L V6 models makes this six-plug NGK Laser Iridium set the clearest year-specific option here. That vehicle range helps narrow the search for a replacement set, while the genuine NGK parts and included hardware support a straightforward parts-selection workflow.

The six-plug quantity and explicit 4.0L V6 application make this listing more targeted than plugs without a stated 4Runner range, helping buyers identify a complete set for the listed years. Its 14 mm thread and 0.04-inch gap provide concrete specifications to compare against service requirements. NGK Laser Iridium construction supplies the listed core material, while the included original packaging and hardware accompany the direct-replacement parts. The listing covers 2013 through 2020, so its stated range is the key fit boundary.

Skip it if you need a listed application for a 2003–2012 4Runner; the DENSO Iridium Long Life set names those earlier years.

For owners matching the stated 2013–2020 4Runner 4.0L V6 application, this six-piece NGK set offers a specific replacement path. Treat the listed year range as its boundary; it does not cover every 5th-generation model year.

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

#2 · Twin-Tip Design

2. Sixity Auto DENSO Iridium TT

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

Best for: Twin-tip DENSO 4Runner plugs.

Why it ranks #2: The six-plug DENSO Iridium TT listing names 2003–2013 4Runner 4.0L V6 fitment and describes a 0.4mm iridium, 0.7mm platinum twin-tip design.

DENSO Iridium TT twin-tip technology is the defining feature of this six-plug set, with a 0.4 mm iridium center electrode paired with a 0.7 mm platinum tip. The listing names Toyota 4Runner 4.0L V6 models from 2003–2013, giving buyers a specific application range.

The stated 2003–2013 4Runner 4.0L V6 range helps buyers assess whether this six-piece set matches the vehicle, while Iridium TT construction differentiates it from standard single-material descriptions. DENSO lists a 0.4 mm iridium center electrode and 0.7 mm platinum tip, and says the larger spark translates to more power and superior fuel economy. The M14x1.25 thread is another comparison point. The listed range ends in 2013, so later models are outside its stated application.

Skip it if you need a listed 2014–2020 4Runner application; Sixity Auto NGK Laser Iridium 4024124418 names those later 4.0L V6 models.

For a 2003–2013 4Runner 4.0L V6 owner considering DENSO’s twin-tip construction, this six-piece set offers a defined application and electrode details. Its stated years do not extend beyond 2013.

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

#3 · Long-Life Iridium

3. Sixity Auto DENSO Iridium Long Life

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

Best for: Early 4.0L V6 DENSO set.

Why it ranks #3: This six-pack specifically lists 2003–2013 4Runner 4.0L V6 fitment and identifies DENSO Iridium Long Life plugs with a platinum ground strap.

A stated 2003–2013 Toyota 4Runner 4.0L V6 application makes this six-pack DENSO Iridium Long Life set a targeted option for earlier trucks. DENSO’s fine-wire 0.4 mm iridium center electrode supplies a concrete construction detail alongside its vehicle-specific range.

The listed 2003–2013 4.0L V6 application helps buyers narrow fitment by vehicle and engine, while six plugs provide the quantity shown for the set. DENSO describes a fine-wire 0.4 mm iridium center electrode and a patented iridium alloy plug with a platinum ground strap; those named materials distinguish its construction. The additional description lists a 0.044-inch gap for the application, while the specifications show 0.04 inches, so check the relevant requirement rather than assume they are interchangeable.

Skip it if you need a listed 2014–2020 4Runner application; Sixity Auto NGK Laser Iridium 4024124418 names those later 4.0L V6 years.

For owners of a 2003–2013 4Runner 4.0L V6, this six-piece DENSO set combines an explicit application with described iridium and platinum construction. Its listed year range is the fit boundary.

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

#4

4. Sixity Auto NGK Iridium IX

Best for: Earlier 4Runner NGK Iridium IX.

Why it ranks #4: The title states six NGK Iridium IX plugs for 2003–2013 4Runner 4.0L V6 models, giving it relevant year overlap despite the older application range.

A six-piece NGK Iridium IX set listed for Toyota 4Runner 4.0L V6 models from 2003–2013 gives early-model shoppers a defined vehicle range. Its fine-wire iridium center electrode and nickel-alloy ground electrodes are the stated construction features behind the listing’s horsepower and torque claim.

The named 2003–2013 4Runner 4.0L V6 application gives buyers a useful year-and-engine scope, while the six-piece quantity identifies the supplied set size. NGK’s precision laser-welded electrode construction combines a fine-wire iridium center electrode with nickel-alloy ground electrodes, which the listing associates with maximum horsepower and torque. It also states use for fuel-injected and turbocharged engines. Because its stated 4Runner range ends in 2013, later-year shoppers need a different application listing.

Skip it if you need an explicitly listed 2014–2020 4Runner set; Sixity Auto NGK Laser Iridium 4024124418 covers those 4.0L V6 years.

This NGK set suits owners within the stated 2003–2013 4Runner 4.0L V6 range who value its electrode details and six-piece quantity. Later 4Runner years fall outside the listed application.

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

#5 · Six-Pack NGK

5. 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: Heat-range resistance seekers.

Why it ranks #5: It includes six 14mm-thread iridium plugs and NGK cites a wider operating heat range, but the supplied listing does not specify 4Runner fitment.

A wider operating heat range is the defining feature of NGK’s six-pack Iridium Spark Plugs, giving buyers a stated heat-range distinction when selecting plugs. NGK also says they resist carbon buildup and pre-ignition, making those operating concerns central reasons to examine this set.

The wider heat-range operation is paired with stated resistance to carbon buildup and pre-ignition, connecting the plug’s listed operating properties to buyers weighing those concerns. NGK’s patented triple-gasket sealing process is intended to eliminate combustion-gas leakage, a specific sealing benefit rather than a generic performance claim. The six-pack provides a set quantity, and the 14 mm thread diameter with 1.25 mm pitch offers dimensions for comparison. However, the listing does not identify a 4Runner application, so fitment research remains essential.

Skip it if you want a listed 4Runner year range; Sixity Auto NGK Laser Iridium 4024124418 explicitly names 2013–2020 4.0L V6 models.

This six-pack suits buyers prioritizing NGK’s stated heat-range and sealing features, provided they can establish application fit independently. Its listing gives thread dimensions but no 4Runner year or engine range, which limits vehicle-specific certainty.

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

#6

6. DENSO 3324 Iridium

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

Best for: DENSO four-plug buyers.

Why it ranks #6: This genuine DENSO iridium set includes four plugs with 14mm threads, but its pack quantity and missing 4Runner-specific fitment make it less compelling.

DENSO’s Iridium Long Life designation is the primary draw of this four-piece SK16R11 set, giving shoppers a named plug type from a genuine-parts listing. Its 14 mm thread specification adds a practical comparison point, while the four-plug quantity sets the scope of a purchase.

The listing identifies genuine DENSO 3324 parts and Iridium Long Life plugs, helping shoppers distinguish this option by brand and stated plug type. Original packaging and hardware are included, so the order arrives with the listed accompanying items rather than plugs alone. A 14 mm thread size provides a dimensional reference for checking service requirements. The pack contains four, which may be convenient when that quantity is needed but does not supply six plugs together; the listing does not name a 4Runner year range.

Skip it if you need six plugs and a stated earlier 4Runner application; Sixity Auto DENSO Iridium Long Life 4056443035 lists six for 2003–2013 4.0L V6 models.

This DENSO set fits buyers whose plan calls for four Iridium Long Life plugs and who can verify the application from vehicle requirements. Its listing supplies no 4Runner year range, so do not treat the product title as a vehicle-specific fit claim.

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

#7 · Eight-Plug Pack

7. NGK 4469 Iridium IX

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

Best for: Eight-pack NGK replenishment.

Why it ranks #7: Its eight NGK iridium plugs have a stated 14mm thread and 0.04-inch gap, but the listing says to research fitment rather than confirming a 4Runner application.

Eight NGK Iridium IX plugs give this listing a larger quantity than the six-piece options, which can suit buyers organizing extra replacements or more than one maintenance need. NGK’s OEM-supplier positioning and iridium construction provide the product’s other defining details.

The eight-piece quantity is the practical distinction: it gives buyers more plugs in one package than the six-piece sets in this roundup, though it is not tailored to a stated 4Runner application. NGK describes its plugs as often specified as original equipment and emphasizes its OEM-supplier role, offering brand context for the Iridium IX selection. The 14 mm thread and 0.04-inch gap are comparison specifications. The listing recommends researching engine, drivetrain, and quantity requirements before purchase.

Skip it if you want an explicit 4Runner year range with six plugs; Sixity Auto NGK Laser Iridium 4024124418 lists six for 2013–2020 4.0L V6 models.

This larger NGK pack suits buyers who need eight plugs and have confirmed the application independently. For a 5th-gen 4Runner search, the lack of a stated vehicle range is an important boundary, not evidence of fit.

Listed on Amazon as: NGK (4469) LFR5AIX-11 Iridium IX Spark Plug (8 Pack)

#8

8. NGK 4469 Iridium IX

• Core Material: Iridium
• Top Material Type: Nickel
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14mm-1.25mm

Best for: Fine-wire Iridium IX shoppers.

Why it ranks #8: This six-pack provides NGK Iridium IX plugs with a stated 14mm-1.25mm thread and 0.04-inch gap, but gives no 4Runner-specific application.

A fine-wire iridium center electrode and nickel-alloy ground electrodes distinguish NGK’s six-pack Iridium IX plugs, with the listing linking that construction to horsepower and torque. Precision laser electrode construction adds a specific manufacturing detail for buyers comparing plug designs.

The fine-wire iridium center electrode and nickel-alloy ground electrodes are the stated construction behind the listing’s horsepower and torque claim, while precision laser electrode construction describes how the electrodes are made. NGK also identifies fuel-injected and turbo engines as intended applications. The six-plug pack matches the quantity of a complete set for some vehicles, but no 4Runner years are named here. A 14 mm-1.25 mm thread and 0.04-inch gap help with specification comparisons, not vehicle confirmation.

Skip it if you need a stated 4Runner year range; Sixity Auto NGK Laser Iridium 4024124418 lists compatibility with 2013–2020 4.0L V6 models.

This NGK set suits shoppers focused on fine-wire electrode construction and a six-piece quantity, with fuel-injected and turbo applications named. For a 5th-gen 4Runner, independently establish fit because no model-year range appears.

Listed on Amazon as: NGK 4469 Iridium IX Spark Plugs LFR5AIX11 (6 Pack)

#9

9. NGK 4344 Iridium IX

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

Best for: Four-plug NGK selection.

Why it ranks #9: The four-pack lists iridium construction, a 14mm thread and 0.04-inch gap, yet its supplied details do not confirm Toyota 4Runner fitment.

A four-plug pack distinguishes the NGK 4344 Iridium IX listing, giving buyers a smaller quantity to consider when planning a partial replacement or sourcing plugs separately. Its iridium core and NGK’s OEM-supplier positioning add context, but the listing expressly advises researching application fit before purchase.

NGK describes the 4344 as an Iridium IX plug and says its plugs are often specified as original equipment, which may appeal to buyers comparing an established supplier’s offering. The four-piece quantity can suit a buyer who needs fewer plugs than a full six-plug set, but it does not provide six at once. A 14 mm thread and 0.04-inch gap offer useful comparison points. Since no 4Runner application is stated, engine and drivetrain research is important before selecting it.

Skip it if you need six plugs in one package for a stated 4Runner range; Sixity Auto NGK Laser Iridium 4024124418 lists six for 2013–2020 4.0L V6 models.

Consider this NGK four-pack if its quantity and specifications suit your maintenance plan and you have verified the application. It is not a stated 4Runner-specific listing, and its four plugs do not make a six-piece set.

Listed on Amazon as: NGK 4344 LTR5IX-11 Spark Plug (Iridium IX) (pack of 4)

#10

10. NGK TR5IX

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

Best for: Eight-piece Laser Iridium supply.

Why it ranks #10: This eight-pack offers NGK iridium plugs with 14mm threads, but provides no 4Runner year or engine fitment, so buyers must independently verify application.

An eight-plug quantity paired with NGK Laser Iridium construction defines this pack for buyers seeking a larger supply of the named plug type. NGK presents the plugs as often specified as original equipment, but the listing asks shoppers to research vehicle and engine applications before buying.

Eight plugs make this pack useful to buyers whose planned quantity exceeds a six-plug set, while the Laser Iridium designation identifies its construction. NGK’s OEM-supplier positioning offers brand context, and the listing’s 14 mm thread size gives a concrete dimension to compare with service requirements. NGK specifically calls for application research covering vehicle, trim level, and quantity, so those checks matter for a 4Runner purchase. The listing itself does not name 4Runner years or an engine application.

Skip it if you want six plugs tied to a listed 4Runner range; Sixity Auto NGK Laser Iridium 4024124418 names 2013–2020 4.0L V6 models.

Choose this pack when eight NGK Laser Iridium plugs match your needs and you can verify vehicle application separately. For a 5th-gen 4Runner, its unspecific fitment information is a meaningful limit.

Listed on Amazon as: NGK Spark Plug TR5IX 7397 Pack of 8