Best Spark Plugs For Toyota Highlander: 10 Fitment Options

#1 · Best Overall

1. NGK Iridium IX

• Core Material: Iridium
• Gap Size: 0.04 in
• Compatible with Vehicle Type: Car

Best for: 2008–2016 3.5L V6 replacement.

Why it ranks #1: Explicitly fits Highlander 3.5L V6 models from 2008 through 2016; the six-piece set has an iridium core and a listed 0.04-inch gap.

A six-plug NGK Iridium IX set is listed specifically for 2008–2016 Toyota Highlander 3.5L V6 models, giving owners a vehicle- and engine-specific replacement option. Its iridium core and 0.04-inch gap provide concrete specifications for buyers comparing plug construction and listed application before planning a replacement.

The Highlander-specific 3.5L V6 application and six-piece quantity make this a straightforward match on paper for a listed 2008–2016 vehicle needing a full set. NGK Iridium IX construction provides the iridium-core option, while the stated 0.04-inch gap gives a defined measurement to compare with service requirements. Original packaging and hardware are included, and the listing describes the plugs as direct replacement parts; the stated vehicle range does not cover every Highlander engine or year.

Skip it if you own a 2001–2010 3.0L or 3.3L V6 Highlander; Sixity Auto’s NGK V-Power set lists those applications.

Choose this set if your Highlander is a listed 2008–2016 3.5L V6 and you want six NGK Iridium IX plugs with supplied hardware. Its stated application does not cover the older 3.0L or 3.3L V6.

Listed on Amazon as: 6 pc NGK Iridium IX Spark Plugs for Toyota Highlander 3.5L V6 2008-16

#2 · Twin-Tip Iridium

2. DENSO Iridium TT

• Core Material: Platinum
• Thread Size: M14x1.25
• Gap Size: 0.4 millimeters
• Compatible with Vehicle Type: Car, Truck

Best for: Twin-tip 3.5L V6 replacement.

Why it ranks #2: Specifically listed for Highlander 3.5L V6 applications from 2008 through 2016, with a six-plug set and 0.4-millimeter gap.

DENSO Iridium TT pairs a 0.4 mm iridium center tip with a 0.7 mm platinum tip, giving this six-plug set a clearly specified twin-tip construction. It is listed for 2008–2016 Toyota Highlander 3.5L V6 models, letting owners compare a named DENSO design within that application.

The Highlander-specific year and engine listing helps narrow the application to 2008–2016 3.5L V6 models, and six plugs provide a set quantity suited to a full replacement. DENSO’s Iridium TT design combines a 0.4 mm iridium center electrode with a 0.7 mm platinum ground electrode, giving buyers precise construction details to compare. The listing describes a larger spark as translating to more power and fuel economy, but those statements are product claims rather than measured results here.

Skip it if you have a 2017 Highlander; Sixity Auto’s DENSO Iridium Long Life set specifically lists that year.

Consider this set for a listed 2008–2016 3.5L V6 Highlander when twin-tip electrode details matter to your selection. Its supplied application range ends at 2016, so later model years fall outside the stated fitment.

Listed on Amazon as: 6 pc DENSO Iridium TT Spark Plugs for Toyota Highlander 3.5L V6 2008-16

#3 · Broad V6 Coverage

3. E3 Spark Plugs

Best for: Broad 3.5L V6 year coverage.

Why it ranks #3: Its six-plug set is listed for Highlander 3.5L V6 models across a broad application range, and the product describes its DiamondFIRE electrode design.

E3’s six-plug set lists 2008–2022 Highlander 3.5L V6 fitment, offering broader stated year coverage than several other 3.5L options here. Its DiamondFIRE design uses an edge-to-edge spark path intended to replenish the spark zone with a fresh charge.

The 2008–2022 3.5L V6 application makes this listing relevant across a long span of Highlander model years, and the six-plug quantity suits a full set purchase. E3 describes its DiamondFIRE edge-to-edge spark path as replenishing the spark zone with a fresh charge. The listed resistor is intended to reduce electromagnetic interference, while a gasket seat is also identified. The manufacturer further claims increased power and reduced fuel consumption; those are stated aims, not quantified outcomes in the supplied details.

Skip it if you own a 2017 Highlander and prefer DENSO’s long-life electrode construction; Sixity Auto’s DENSO Iridium Long Life set lists that year.

Consider this set if your Highlander is a listed 2008–2022 3.5L V6 and you value E3’s described spark-path design. The stated application stops at 2022, so later models are outside its coverage.

Listed on Amazon as: 6 pc E3 Spark Plugs compatible with Toyota Highlander 3.5L V6 2008-2022

#4 · Double-Iridium Type

4. X4XZ Double Iridium

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

Best for: Non-hybrid 3.5L V6 owners.

Why it ranks #4: The listing names Highlander 3.5L applications and replacement references 90919-01247 and FK20HR11; verify exact engine and hybrid fitment.

X4XZ’s 6176 double-iridium plugs list 2008–2016 Highlander 3.5L applications while explicitly distinguishing hybrid fitment, making that boundary central to selection. The six-piece quantity and 14 mm thread size add practical details for owners comparing a replacement set against their vehicle’s requirements.

The listing names 2008–2016 Highlander 3.5L models and separately notes Highlander Hybrid years, while cautioning that the stated fit is not for Hybrid. That distinction is important when choosing among vehicles sharing a model name. Six plugs are included, and the 14 mm thread size supplies a concrete specification for comparison. The product is identified as double iridium, but buyers should treat the hybrid exclusion as a firm application boundary rather than assuming the similar engine description guarantees compatibility.

Skip it if you own a Highlander Hybrid; Sixity Auto’s DENSO Iridium Long Life listing covers the 2017 Highlander, without the same stated hybrid exclusion.

This set is for shoppers whose Highlander falls within the listed 3.5L application and outside the explicit Hybrid exclusion. Check that distinction carefully; the shared model name does not erase the product’s stated boundary.

Listed on Amazon as: X4XZ 6176 Double Iridium Spark Plug 6PCS Replaces # 90919-01247 FK20HR11

#5 · Fine-Wire Electrode

5. DENSO Iridium Long Life

Best for: 2017 Highlander DENSO option.

Why it ranks #5: Listed for a Highlander application with a 0.032-inch gap; its 0.4-millimeter iridium center electrode and platinum ground electrode are specified.

DENSO’s Iridium Long Life plug specifies a fine-wire 0.4 mm iridium center electrode and a 0.7 mm platinum ground electrode, giving its construction clear detail. The listing names the 2017 Toyota Highlander and supplies six plugs for owners shopping that specific model year.

This listing identifies the 2017 Highlander and provides six plugs, making its stated application notably specific rather than a broad multi-year range. DENSO’s 0.4 mm fine-wire iridium center electrode and 0.7 mm platinum ground electrode give buyers two construction details to weigh when comparing plug designs. The description calls the product Iridium Long Life and says its larger spark translates to more power and fuel economy. No other Highlander model years are named in the supplied fitment details.

Skip it if you need a 2008–2016 3.5L V6 set; Sixity Auto’s DENSO Iridium TT listing names those Highlander years.

This DENSO set fits the buyer seeking a six-plug option specifically listed for a 2017 Highlander, with fine-wire iridium and platinum electrode details. Its supplied fitment does not establish coverage for other years.

Listed on Amazon as: 6 pc DENSO Iridium Long Life Spark Plugs for Toyota Highlander 2017

#6

6. Champion Iridium

Best for: 2017–2020 3.5L V6 owners.

Why it ranks #6: The six-plug set is explicitly listed for Highlander 3.5L V6 applications, with a 0.031-inch gap shown in the supplied fitment details.

Champion Iridium plugs are listed for 2017–2020 Toyota Highlander 3.5L V6 models, making the six-piece set a clearly targeted option for that year and engine range. Champion describes its plugs as using durable precious metals for long-lasting, powerful performance.

The listing’s 2017–2020 3.5L V6 application narrows the target vehicle, and six plugs are included for owners shopping a full set. Champion identifies the plugs as iridium and describes its ignition parts as intended to support long-lasting, powerful performance. Additional fitment details specify plug type REC10WMPB and a 0.031-inch gap for the listed 2017 and 2018 Highlander. The supplied information does not provide those year-specific details for every year in the title range.

Skip it if you need a DENSO plug specifically listed for a 2017 Highlander; Sixity Auto’s DENSO Iridium Long Life set names that year.

This Champion set suits owners of a listed 2017–2020 3.5L V6 Highlander seeking six iridium plugs. Note that the supplied plug-type and gap details identify 2017 and 2018, not every year in the title range.

Listed on Amazon as: 6 pc Champion Iridium Spark Plugs for Toyota Highlander 3.5L V6 2017-20

#7

7. NGK V-Power

• Core Material: Copper
• Thread Size: 10×1.25mm
• Gap Size: 0.04 in
• Compatible with Vehicle Type: Car, Truck

Best for: Older V6 copper-plug replacement.

Why it ranks #7: A six-plug copper set listed for Highlander 3.0L and 3.3L V6 engines, making it a relevant option for those earlier-engine applications.

NGK V-Power’s copper-core construction distinguishes this six-plug set, which is listed for 2001–2010 Toyota Highlander 3.0L and 3.3L V6 models. Its stated 0.04-inch gap and 10×1.25 mm thread specification give owners of those older engines defined details to compare.

The listed 2001–2010 Highlander range covers both 3.0L and 3.3L V6 engines, making the engine designation important when narrowing a replacement. Six plugs are included, and NGK V-Power’s copper core identifies the electrode material. The 0.04-inch gap and 10×1.25 mm thread specification add comparison points for installation planning. Original packaging and hardware are included, and the product is described as a direct replacement; its stated coverage does not extend to later Highlander years.

Skip it if you own a 2008–2016 3.5L V6 Highlander; Sixity Auto’s NGK Iridium IX set lists that newer engine application.

This NGK V-Power set suits owners of a listed 2001–2010 3.0L or 3.3L V6 Highlander seeking a six-plug copper-core option. Its application does not cover later 3.5L V6 models.

Listed on Amazon as: 6 pc NGK V-Power Spark Plugs for Toyota Highlander 3.0L 3.3L V6 2001-10

#8

8. DENSO Platinum TT

• Core Material: Platinum
• Thread Size: M14x1.25
• Gap Size: 0.04 in
• Compatible with Vehicle Type: Car, Truck

Best for: Older Highlander platinum twin-tip.

Why it ranks #8: Listed for Highlander 3.0L and 3.3L V6 applications and specifies a platinum core with a 0.04-inch gap.

DENSO Platinum TT uses a 1.1 mm platinum center electrode paired with a titanium-enhanced ground strap, setting this six-plug set apart by its stated twin-tip design. It is listed for 2001–2010 Highlander 3.0L and 3.3L V6 models.

The 2001–2010 Highlander 3.0L and 3.3L V6 listing helps owners match this set to the older engine range, while six plugs provide a complete set quantity for the listed application. DENSO specifies a 1.1 mm platinum center electrode and titanium-enhanced ground strap as its Platinum TT construction. The stated 0.04-inch gap and M14x1.25 thread size provide further measurements for comparison. DENSO describes a larger spark as supporting faster starts, power, and fuel economy; those are product claims.

Skip it if you have a 2008–2016 3.5L V6 Highlander; Sixity Auto’s DENSO Iridium TT set lists that newer engine application.

Pick this DENSO Platinum TT set for a listed 2001–2010 3.0L or 3.3L V6 Highlander when its platinum twin-tip details suit your comparison. Its fitment does not cover newer 3.5L V6 models.

Listed on Amazon as: 6 pc DENSO Platinum TT Spark Plugs for Toyota Highlander 2001-10

#9

9. A-NAFTULY Iridium

• Core Material: Iridium
• Thread Size: 14mm
• Gap Size: 0.04 in
• Compatible with Vehicle Type: Car, Truck, Van

Best for: Older 2.4L four-cylinder owners.

Why it ranks #9: The four-plug listing includes Highlander L4 2.4L applications; it is less broadly useful than the six-plug V6 sets and needs exact fitment confirmation.

This A-NAFTULY set lists fitment for 2001–2007 Highlander 2.4L L4 models, differentiating it from six-plug V6 sets in this roundup. Four plugs are included, and the stated 0.040-inch gap and 14 mm thread size give buyers concrete details to compare.

The listed Highlander application is specifically the 2.4L L4 for 2001–2007, helping owners distinguish it from the 3.0L and 3.5L V6 applications elsewhere. Its four-plug pack corresponds to that listed four-cylinder application rather than a six-plug V6 set. The product identifies iridium as its core material and gives a 0.040-inch gap and 14 mm thread size. Those specifications aid comparison, but they do not broaden the stated year and engine coverage.

Skip it if you drive a 3.5L V6 Highlander from 2008–2016; Sixity Auto’s NGK Iridium IX set lists that engine and year range.

Choose this four-pack only when the listed 2001–2007 Highlander 2.4L L4 application matches your vehicle and a four-plug set suits the job. It is not the listed choice for V6 Highlanders.

Listed on Amazon as: Iridium Spark Plugs 4 Pack 7092 BKR6EGP Fit for Toyota Camry RAV4 Celica Solara Matrix Corolla Highlander, Dodge Neon, Pontiac Vibe, Scion tC xB, Honda CRZ, Subaru Forester Impreza, Acura Integra

#10

10. NGK 6619 Iridium

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

Best for: Iridium-plug feature comparison.

Why it ranks #10: This six-pack NGK iridium listing supplies plug details but does not specify Highlander fitment, so buyers must independently verify the part number.

NGK’s Iridium IX plugs are specified to operate across a wider heat range than ordinary plugs, a feature intended to help buyers weighing operating conditions. The six-pack format suits a full-set purchase, while the listing also cites resistance to carbon buildup and pre-ignition as defining characteristics.

The stated wider heat-range operation gives these plugs a specific point of comparison for buyers considering how plug design relates to engine operating conditions. NGK also says the plugs resist carbon buildup and pre-ignition, while its patented triple-gasket sealing process is intended to prevent combustion-gas leakage. Six plugs are included, and the 14 mm diameter with 1.25 mm pitch supplies thread measurements for comparison. The product information does not identify a Highlander year or engine application.

Skip it if you need a Highlander-specific 2008–2016 3.5L V6 listing; Sixity Auto’s NGK Iridium IX set names that application.

This six-pack suits shoppers comparing NGK Iridium IX features, including its sealing process and stated heat-range operation. The listing does not name Highlander applications, so its thread measurements alone do not establish a vehicle match.

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