NGK LFR6AHX-S Ruthenium HX Spark Plug
Priced as of May 27, 2026
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- Gold · #1DensoSK20HR11 Iridium Long Life Spark PlugCCT 7.8
- Silver · #2NGKILFR6T11 Laser Iridium Spark PlugCCT 7.6
- Bronze · #3You're hereNGKLFR6AHX-S Ruthenium HX Spark PlugCCT 7.5
CarCareTruth's Analysis
Last reviewed May 27, 2026
TL;DR NGK is the OE supplier for the Toyota 1GR-FE V6; this ruthenium-alloy center / platinum-tipped DFE plug is rated 100,000+ miles. Community removal-photo data has not yet been located.
What it is and how it performs
The LFR6AHX-S uses a 0.4mm ruthenium-alloy center electrode and a platinum-tipped fine-wire ground in NGK's DFE design. Ruthenium is a newer PGM center-electrode material in the NGK line; the ILFR6T11 Laser Iridium covers the same fitment with an undisclosed iridium tip diameter. Heat range 6, M14×1.25, 26.5mm reach, and 0.043" factory gap match the Toyota 1GR-FE V6 spec across Tacoma, 4Runner, FJ Cruiser, and Tundra applications. NGK claims 100,000+ miles; only 3 Amazon reviews exist and no community removal photos have been located, so scores are treated as provisional.
Who should buy this — and who should skip it
Right pick for 2005–2015 Toyota Tacoma 4.0L V6, 4Runner, or FJ Cruiser owners wanting NGK OE-supplier build quality at a ruthenium material grade. Skip if documented long-term confirmation matters: the Laser Iridium ILFR6T11 covers the same 1GR-FE application set with more community data behind it.
Safety and environmental impact
No chemical exposure pathway: passive ignition-system part, no SDS. Ruthenium and platinum PGM mass per plug is milligram-scale; the 100,000-mile rated interval offsets per-vehicle-mile consumption relative to copper-class plugs. Steel shell recycles as ferrous scrap; alumina-ceramic insulator goes to landfill.
Frequently asked questions
What vehicles does the NGK LFR6AHX-S fit?▾
The LFR6AHX-S is listed for Toyota V6 applications using the 1GR-FE engine, including the 2005–2015 Tacoma 4.0L V6, 2003–2009 4Runner 4.0L V6, 2007–2014 FJ Cruiser 4.0L V6, and Toyota Tundra V6 applications. Always confirm fitment against your specific year and engine using the NGK application guide.
How does the Ruthenium HX compare to the NGK Laser Iridium for the same Toyota applications?▾
Both target the same applications (same heat range 6, M14×1.25, 26.5mm reach). The Ruthenium HX uses a ruthenium-alloy center electrode — a newer PGM material than the iridium-tipped center on the Laser Iridium ILFR6T11. NGK claims 100,000+ miles for both; community long-term removal-photo data is more extensive for the established Laser Iridium line.
Is the NGK LFR6AHX-S an Amazon add-on item?▾
Yes — the LFR6AHX-S (ASIN B07CV44KH2) is an Amazon add-on item. It requires meeting a minimum qualifying order threshold or Subscribe & Save to purchase as a standalone item. Buying a full 6-plug set for a V6 engine typically clears the threshold in a single order.
What is the factory gap for the LFR6AHX-S?▾
The factory gap is 0.043 in / 1.1 mm — the standard Toyota Tacoma 4.0L V6 (1GR-FE) specification. NGK pre-sets the gap; community gap-distribution reports for this specific part number have not yet been located given the limited review sample.
Does the NGK LFR6AHX-S have a Prop 65 warning?▾
No — the product page does not carry a California Prop 65 warning, confirmed from the Rainforest API product data.
From the manufacturer
Marketing copy from NGK, via Amazon. Not editorial.
- •Package dimensions: 9.4 cms L x 2.4 cms W x 2.1 cms H
- •Package quantity: 1
- •Product type: Spark_Plug
- •Country of Origin: Japan
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Manufacturer specifications
- Brand
- NGK
- Core Material
- Copper
- Thread Size
- M14x1.25
- Top Material Type
- Ruthenium Alloy
- Vehicle Service Type
- Year, Make, Model, Submodel
- Brand Name
- NGK
- Manufacturer Part Number
- LFR6AHX-S
- Global Trade Identification Number
- 00087295941225
- UPC
- 087295941225
- OEM Equivalent Part Number
- LFR6AHX-S
- Model Number
- LFR6AHX-S
- Unit Count
- 1.0 Count
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